The Pentaholics have entered the chat!

it is called "Mitch Slapped". Happens to all of us.

There isn't any genre of music, the Pentatonix CAN'T do! They are "THE" Acapella group! Their cover of IMAGINE really shows off their talents and sends a beautiful message too!

You've got to check their Daft Punk medley......mindblowing!

Welcome to the World of PTX, the greatest a cappella group to set foot on a stage. You will soon be deluged with reaction suggestions from their fans (Pentaholics), and each one will be mind-blowing. You might want to check out "Bohemian Rhapsody", 'Run to You", "The Prayer" and "Sound of Silence" for starters. Your usual fine reaction, btw.

Daft Punk, Can't Hold Us, 90's Dance Medley, Blinding Lights. Everything Pentatonix does is pure ear candy!

Pentatonix They won The Sing Off in 2011. They made a guest starring appearance on America′s Got Talent as non−competitors a couple of years after that. The founding members are:- Scott Hoying (tall blond guy, natural baritone but has an impressive five−to−six octave range, can go all the way up to high tenor and down to bass, sings the bass lines when the usual bass singer takes the lead); Kirstin "Kirstie" (Rhymes with "Thirsty") Maldonado (the only female member, natural mezzo soprano, but can go down to low alto and as high as upper soprano, also can sing in whistle notes that are off the scale); For a time in 2018 between the group’s tours, had the female lead on Broadway in the production of “Kinky Boots”. Mitch Grassi (a true contra−tenor, can hit high notes in his chest voice with ease and go WAY higher in his falsetto, also with ease); Avriel "Avi" Kaplan (dark beard and long hair), true basso profundo, trained as an opera singer, also can go up into the tenor range; and Kevin "KO" Olusola (beatboxer extraordinaire, also is a world−class cellist who plays cello on some of their songs, has a beautiful high tenor voice and gets occasional lead vocal solos as well, graduated pre−med from Yale and speaks several languages including Mandarin Chinese). Kirstie, Scott & Mitch grew up together in Arlington, Texas, and began performing together as children in local youth musical theater. They ended up in high school together and performed in the choir. While there, they formed an a cappella group called The Trio which had several performance videos go viral on KZfaq, most notably a cover of Lady Gaga′s "Telephone". The three of them are best friends and consider themselves to be almost siblings. Scott & Kirstie (who were a class year ahead of Mitch) both graduated high school in 2010 and went their separate ways to different colleges, Scott at USC and Kirstie at Oklahoma. While at USC, Scott joined a USC−based a cappella group called the SoCal VoCals, where he met alumnus Ben Bram, who was now an arranger and vocal coach for the NBC TV show The Sing Off, an a cappella competition show. Ben convinced Scott to get The Trio to audition for the show. The three reunited (Mitch had to skip high school graduation ceremonies to go) in Los Angeles for the audition. They found out that the rules had changed, so they needed at least five members to audition. Ben put them together with Avi (a native of Visalia, California), who he knew from Avi′s performing days at Mount San Antonio College in California. They found Kevin (from Kentucky) through one of his KZfaq videos that had gone viral featuring him playing the cello and beatboxing at the same time, a talent that Kevin coined as "Cello−Boxing". Kevin arrived in Los Angeles literally the day before the audition! Scott came up with the name "Pentatonix" after the pentatonic scale. They performed a re−arrangement of "The Telephone" for the audition and passed, despite having been together as a five−piece group for less that 24 hours! They won The Sing Off that season (all of the performances are available on KZfaq), in which they received a substantial cash prize AND a record contract with Epic Records. They pooled their prize winnings together and all moved to Los Angeles, and all got apartments right next door to each other in the same building. But just a week later, Epic dropped them because the marketing people didn′t think an a cappella group could sell records. Instead of giving up, they were determined and began recording their own songs on KZfaq, hiring Ben Bram as their producer and arranger. These usually consisted of the five of them sitting on a couch and performing cover songs live. Several of the videos went viral, and Sony (the parent company of Epic) decided to give them another chance by placing them on one of their smaller labels, Madison Gate. They released two secular EPs and one Christmas EP on Madison Gate, all of which were strong sellers. But when their cove r of a medley of songs by Daft Punk not only went super−viral, but also won them their first Grammy, they were promoted all the way up to RCA Records, Sony′s top label. They began writing and producing their own songs in addition to their covers, began putting out a Christmas album just about annually (which has become their best−selling genre), and have had multi−platinum album sales, sold−out world tours, and have won two additional Grammys. Avi began getting burned out with all of the touring and heavy recording schedule, was suffering from anxiety and personal problems, and learned that his mother had been diagnosed with cancer in 2017. He announced he was departing from the group and taking some time away from the music industry. Matt Sallee (from Baltimore) joined them in September 2017. He did only become official when they renewed their RCA contract in February 2018, but he recorded with them in September as a featured artist and went on their Christmas tour as a featured artist, as well. When he attended the audition for the group, he had already mastered the Bass part for most if not all their past catalogue. He was successful and has proved that he fits in well with the group. If you think there have been other changes to the line up - look again. This is the ONLY change. Kirstie and Mitch are like chameleons and change looks frequently. After a year away from music, Avi has now returned as a phenomenal solo artist in the Folk/Americana/Roots genre. Ben Bram has been in charge of their production, including arranging and directing from the beginning. He is often referred to as the sixth member. Scott and Kevin are major players in the arrangements, but every member contributes. good watch is "The Recording of Evergreen" where a camera was invited into the studio for the second week of recording/ Also, all members are songwriters for both Pentatonix and their own solo work. Ed Boyer who mixes everything of theirs (even the HWB Livestream) is the one who pulled Ben Bram into the sing off in the first place. They were nominated for a 4th Grammy for their album Evergreen, but didn't win. Kirstie became a new mum which caused a pause in touring after their Evergreen Christmas tour 2021. Mid March 2023 Kirstie has announced that she is engaged to Ben Hausdorff, their videographer. No dates YET! They have a star on the Hollywood walk of fame installed in February 2023. They are the only a capella group with a star! Things you need to know because if you get these wrong Pentaholics will come after you with pitch forks and torches! Ha Ha!! 1- There is NO Auto-Tune; what you hear is actually what they sing. They really are that good. One exception is the 90's Dance Medley where Cher used autotune as an effect - so they had to. 2- What produces everything that you hear in the video, you see in the official video. If there is an instrument used in the music, you see it on screen. In the 2022 Christmas album, there are some instruments not featured throughout the album. 3- They never release something on video they can’t reproduce with the exact same quality live on-stage.

Anything Pentatonix does is amazing. Amazing Grace cover will give you chills. 90’s dance medley is a trip down memory lane. Anything will surprise you

New sub and avid Pentaholic here to enjoy vicariously as you delve into the journey of discovery that all of us have taken. Of their 200+ videos on their main channel, as well as thier solo and side projects, there is not a dud in the bunch. The bass featured here is Avi Kaplan who left the group in 2017 after 6 years to pursue his own music and to take a break from the hectic and grueling schedule that PTX has. Just look through the lists that I am sure others will provide and go where you feel.

I am a member of the family of Pentaholix, I welcome you into our little corner of heaven. After 700 million views, this video just continues on delighting almost everyone who hears it. It’s ok BTW if a tear falls from time to time, we welcome it, it just shows that you’re human. I say this mostly because as you delve into the world of PTX you’ll find it hard not to get emotional. They sing with conviction and joy, and it can be difficult not to get swept up. Have a tissue handy. Pay attention to release dates as you go, that way you’ll get to know how they’ve changed and evolved. Subscribed for more.

the PTX rabbit hole is o deep we will never see you again!!! so amazing! HomeFree and Voiceplay are alos amazing

Pentatonix is in a league of their own!! Y'all really must listen to "The Prayer", "Amazing Grace The Chains Are Gone", "Mary Did You Know" just to name a few. Their version of "The Prayer" is phenomenal! So glad y'all listened and enjoyed!

PTX started the Acapella craze...they have one of the best selling Christmas Albums (this song is from that album) of all time, and they are multiple Grammy winners....FUN FACT they are also good friends with HomeFree.

Their Sound of Silence is also amazing

I say that this is ONE of their Best. (IMO) Great Post.

I love all of their music. Any cover they do isn’t a copy of the original. It’s an upgrade every single time. I agree with, please, The Prayer next. When I watch your reactions I automatically click the thumbs up because I know it’s going to be a fantastic experience. Thank you so much for sharing this.

Even though they produce a Christmas almost every year, they have covered ALL genres with both covers and originals for the last 12 years.. have Subscribed (and liked) and hoping you will continue to explore all the genius of Pentatonix!!

Welcome to the land of Pentaholics!! I’m sure you will be one soon enough. These guys are AMAZING!!! You should check out their covers of Sound of Silence, Imagine and Mad World. They have a huge songbook and a ton of originals and a whole host of Christmas songs too. Can’t wait to see you react to more of their work!!!❤❤❤❤

Powerful, so well done... what a delight to hear on this Easter Sunday

Oh you are about to be flooded! Bring on the Pentatonix rabbit hole!! 🙌🏼

Pick any song from them and it's amazing! Oh Come All Ye Faithful is still one of my favorite surprises ❤ 😊

Enjoyed your reaction! It's impossible to go wrong with Pentatonix, so I recommend different options all the time. Today I'm going with their cover of Bohemian Rhapsody, Say Something or Shallow, but every other recommendation is amazing as well! Looking forward to your PTX journey!

That guy is Mitch and WE LOVE him i watch these reactions to see the Mitch slap which is the shocked look people have when they first see and hear him you guys weren't shocked but great reaction 👍

These guys are amazing. The 2nd singer is Avi & he has now left the group & was replaced with Matt. Scott is the tall blonde that started the song. The Kirstin & then the little guy with the amazing high voice is Mitch. When people are shocked by him, it's is called being 'Mitch slapped'. Kevin is the beat boxer/percussionist, although he also has the voice of an angel & sings sometimes. I like him on my fav by this group 'Mary did you know?'. Other favorites are 'Bohemian Rhapsody' & 'Sound of silence'. Check out one of their medleys. The do them by decades or by artists like Michael Jackson & they will blow your mind. To me they are the best A Capella group ever.

I Run, Say Something, Evolution of Michael Jackson, The Wizard of Ahhhs, Havana, Cheerleader, Can’t Help Falling In Love With You, Can’t Hold Us, Thank You I could go on, but these are all mandatory!!😊

You should check them out preforming this song live on their Christmas Special. Also, give a listen to a couple originals of theirs called Love Again or Coffee in Bed. Enjoyed your reaction. This group is epic❣️

All their Christmas albums are good too. Yes, they have more than one. Nice reaction.

They’ve really developed over time. It seems like everything they do is great now. Check out their national anthem performance at the last NCAA football championship

Pentatonix and Home Free are the two best acapella groups ever! They are something else and it doesn’t really matter which song you choose to listen to from any of them, you’ll be pleasantly satisfied every time

Welcome from all the Pentoholics 👋 come fall down the rabbit hole with us! Some suggestions are their Daft Punk medley, Sound of Silence, Carol of the Bells, Royals, Can you feel the love tonight, white winter hymnal and so on and so on and so on. PTX are the best!!!!

PENTATONIX sounds of silence, 90's Dance Medley, Daft Punk

Great reaction guys! Even though I prefer Home Free, there is no denying the talent this group has. It's amazing how easy it is to forget that this is acapella.

I believe you two got what is called "Mitch-slapped" with Mitch's voice.

This is by far my favorite version of this oft-covered epic of a song. PTX is a flat-out phenomenon. "Radioactive," "The Prayer," "Jolene" (with Dolly Parton) and "90s Dance Medley" will give you a nice sampling of their vast, wonderful catalog.

Love this group and can listen to them all the time and i love this song!!!

Glad you found ptx and the acapella journey. I dont know if you can both have both ear headphones but most of the best acapella groups pan on each side of the headphones and it greatly enhances the experience listening

Oh my gosh, you are in for a treat jumping into the Pentatonix rabbit hole. Daft Punk Medley, 90's dance Medley, Amazing Grace, The Prayer, Imagine, Sound Of Silence, just to request a few, LOL. Kirsty(the girl...rhymes with thirsty) Scott(The blond), Mitch is the high male vocal and people often get "Mitch slapped" by his vocal abilities. Kevin is the beatboxer and also does harmonies and vocals on occasion) Avi was the original bass member, but left on good terms and was replaced by Matt as bass, but they are both amazingly good. I saw them live for the first time for their Christmas tour in December 2022......UNBELIEVABLY GOOD. I am 64 and a new "Pentaholic" for a while now.

So perfect!

One of their earliest videos…they only get better.

Welcome to the world of PTX, next up, their first Grammy Win, "Daft Punk", they will blow your mind.

Pentatonix is wonderful! You can’t go wrong with anything that they do, they have some fantastic originals and covers. Daft Punk won them a Grammy, $400, an IPad, and pure talent, completely different from Hallelujah ❤. Thank you for sharing this.

Thanks for reacting to Pentatonix. Try their Daft Punk Medley. If you think there is a lot going on with Hallelujah, Daft Punk will blow your mind. They have 11 years of awesome music.

1st singer - Scott (Baritone) but covers bass when the person takes lead vocal). Scott, Kristen and Mitch knew each other in middle school and high school. 2nd singer - Avi (bass) has since left the group due to family issues. Avi was replaced by Matt (first video he is in is ‘Sound of Silence’). 3rd Kristen - (Soprano) only female; performed with Mitch and Scott in high school. 4th - Mitch (counter tenor) - people often are surprised at how high he can sing; he has a 6 octave range (A1 to B7). Last person - Kevin (beatboxer, tenor and cellist); Kevin and Avi were brought in to round out the group when they competed in the TV show “Sing Off” (which they won). Kevin was discovered online through his own KZfaq channel where he beatbox and plays his cello at the same time. Kevin did not sing at first, but with training from Avi, grew more confident in his voice, and started singing tenor. The group has three Grammys - ‘Daft Punk’, ‘Dance of the Sugar Plum Fairies’, and ‘Jolene‘ (with Dolly Parton). Their album “Evergreen” was nominated for best album. Just last month they got a star on the Hollywood walk of fame.

Sir, I congratulate you! Like me, just an ordinary guy who captured a real beauty of a woman, inside and out. We are both very lucky men! Your reaction video are well done too. Be well and happy, Duke

Also their Bohemian Rhapsody is outstanding. That second singer was their bass.

I'm a Pentaholic so i'm biased, but this is a great cover of this song. If you want to hear another that's on this level try Lucy Thomas. At 16 when she recorded this her voice was already timeless. A real senses treat. As far as PTX I don't think they have ever done a bad song. A real deep bunny burrow there to explore. Pick your favorite tune, hit play, and enjoy. Nice show, thank you. 🤠

Yes please - more Pentatonix!!

"Hallelujah" is a "Christmas" song ONLY in the sense that Pentatonix decided to put it on one of their Christmas albums. As is generally true with Pentatonix official videos, the audio was recorded in the studio and the video recorded elsewhere. Technically they're lip-synching in the video, except that the reality is that they also sang while making the video, so all movements are authentic and the timing is perfect. This was recorded in the Mojave Desert just outside of Barstow, California. I'm told that it was a hot August day, with temperatures of over 100° Fahrenheit, but because they wanted to put this on a Christmas album they had to wear winter clothing and pretend it was cold out - makes me sweat just thinking about it.

Great reaction guys! Please listen to their cover of “The Prayer”. If you thought this was good, “The Prayer” will knock your socks off.

Oh, do we have recommendations! Anything at all that Pentatonix has sung. There ya go, our best efforts. LOL Every time they put out a new song we consider that our new fave, but then we listen to the older ones and revive *those* to our faves. You can't win, everything is good. I particularly love "My Heart With You" just because that song was specifically written for five part harmony and really showcases what au capella is meant to be. And surely you've heard Queen do Bohemian Rhapsody. If not, go listen to it, then listen to Penatonix do a hard rock guitar-heavy piece with no instruments. You'll love it.

Listen to Bohemian Rhapsody, The Prayer, Daft Punk, evolution of Michael Jackson etc. had to subscribe PTX are amazing

Welcome to the PTX rabbit hole - and hallelujah is the classic entrance. From here I recommend: „Sound of Silence“, „Daft Punk Medley“, „90ies Dance medley“ „Amazing Grace“ and „Havanna“ (to get an idea of their variety)!

Welcome to the long winding road of Pentatonix, you are in for the journey of your life 😊 Pentatonix never ceases to amaze me, at just how incredibly talented they are, and take their voices to newer levels, we have never heard before.....there is something so special about their ability, to tell the songs story, allowing us to listen with a new perspective, and hear & feel emotions, we may not have heard from the original artist 💖💖💖 *Not only their voices, but their delivery is also their gift!*

They are incredible- 3 grammys, a star on hollywood blvd- I've seen them twice live in concert and they are even better live. welcome to the Pentaholics- keep heading down the rabbit hole... you won't be disappointed!

Pentatonix should come with a warning label...addicting!!!! This was the first song I heard by them and it blew me away. THEN I heard Bohemian Rhapsody and well...that did me in...I am a full fledged Pentaholic!!! We call their covers "upgrades" and after a few more reactions you will understand why!! Their originals such as Sing, Love Again, Run To You, Be my Eyes, and Coffee In Bed...just to name a few...are just as amazing. Pentatonix comes with a huge, loyal fan base and will listen to any reaction we can find. Their label can be stingy when it comes to copyright so you may have to use a filter to prevent the video being blocked. Welcome to the PTX rabbit hole!! Subscribed for more reactions!!

PTX is the absolute Platinum standard of A Cappella. Everything they sing is an upgraded version of it's original or an original song itself. They are absolutely amazing.

For a lot of their music, you will find it beneficial to have a full set of earpieces rather than sharing half each. It's also important to use something that has a good, ie low, bass responce as they can go lower than cheap earpieces can reproduce clearly.

Fantastic group, they do some unbelievable songs. Good reaction.

There are many an argument whether Pentatonix, Home Free, or Voice Play are the BEST acapella group out there. I say "Yes" they are (note I didn't say which one 😁) Anything they do is great and as far as recommendations: Sound of Silence, Bohemian Rhapsody, Amazing Grace (My Chains Are Gone), Imagine. Great reaction and welcome to the "Mitch Slap" (your reaction when the little guy with the high voice that wowed you}.

Mary did you know is my favorite song of theirs. They are all amazing.

The Prayer & Amazing Grace

Great Reaction -- Keep PTX coming!!

I love new Pentatonix reactors! I just subbed in hopes of more PTX reactions! 💖

Hi. Welcome to the amazing world of PTX. They are amazing every single time. Try their cover of “Bohemian Rhapsody “. or their first Grammy “ Daft Punk Medley”. Their talent never ceases to amaze. Penta means five and they took their name from pentatonic scale 5 equal parts of awesome. We who love them welcome you

Song brings tears to my eyes every time. You'd probably love K.D. Lang's version of it. POWERHOUSE vocal.

Pentatonix Bohemian Rhapsody is beyond fabulous!!

It was the most spiritual I have heard. You feel like you are being lifted up

That was amazing. I love this song. Another singer to check out is Lucy Thomas from the UK. She was only 16 when she recorded this song. She has a beautiful voice 😇. Great reaction as always.

Congrats on your first Mitch slap. Any thing from Pentatonix is gold. Keep them coming please.

I will watch any video with the great Avi Kaplan in it. He is the second soloist in this video and a classically trained Basso Profundo He was with PTX for six years and is now a solo artist.

Get ready for this thread to explode!!! The Pentaholics will overwhelm you quickly! They are an amazing "Band"and how they describe themselves. Their covers are considered "UpGrades", and the fans will bombard you with info and requests. They Rule the Christmas Season... and some "covers" are... you'll see. I'd recommend these covers, as long as you are familiar with the Originals. IMAGINE John Lennon Bohemian Rhapsody Queen So many more... Fair ⚠️! Enjoy you both! Thanks for all your hard work!

Next upgrade to react to Sound of Silence. These 5 musical aliens are true masters of their craft. Enjoy the PTX journey.

You all are good and natural reactors. I subscribed! And these folks do a Christmas album every year.

Anything and everything pentatonix. Lol

Hey guys! Welcome to PTX!! Thanks for reacting to Hallelujah! It is one of my favorites by them. Next you need to react to DAFT PUNK MEDLEY. You will be so blown away by their talent. They also won a Grammy for this one. It is so good. You forget there are no instruments and they make it so easy to do that. Not complaining but just making an observation...maybe you should each get your own pair of earbuds. A lot of their music pans from ear to ear and if y'all are sharing you won't hear it. And you must wear headphones 🎧 or earbuds while listening to them. It makes the bass sound much fuller and richer. Thanks again for your reaction! Awesome job! Sending you love from Texas!!!

I have heard Hallelujah is so many versions from the OG version of Leonard cohen, to Jeff buckley RIP to both of them and so many other inbetween BUT this is production wise, the absolute best i have ever heard......................... if i may drop a suggestion try out "Postmodern jukebox ft Morgan James version of " Dream on " or their version of Hoziers " Take me to church" both of these versions will knock your socks off, even if you arent wearing any

Love seeing you get Mitch-slapped at the end. It’s a rite of passage.

"Mary Did You Know" is beautiful

Great reaction! Subbed for more PTX! Love this group!

Yes Amazing Grace. 90's Dance Medley, Bohemian Rapsady, and on and on. Welcome to the PTX rabbit whole

Listen to their Wizard of Ahhhs (the Wizard story done with modern music with Todrick Hall), Amazing Grace, Daft Punk medley and 90's Dance Medley/ You can listen to anything they do - always incredible. 5 amazing singers working seamlessly together. Also "The Prayer."

If you want more songs then the first and foremost you ought to listen to is their rendition of "The Prayer", another very good one is their rendition of "Mary did you know" and they've also made a wonderful 90's medley and a Daft Punk-medley, among a lot of other songs of course. If you want a tip on another very good artist I can recommend a man called Tommy Johansson, he's done a very impressive rendition of "You raise me up" - One octave higher than usual. He does a lot of covers, releases one every friday. He also has his own powermetal band called Majestica and is the lead guitarist of the Swedish powermetal band Sabaton. Well worth looking up.

Welcome to the amazing world of Pentatonix ❤️

I would recommend you watching the group Collabro from Britain's Got Talent, either their initial audition or them singing Bring Him Home. They aren't pure acapella, but 5 voices that together are a gift

I enjoyed your reaction to this beautiful Pentatonix video. Thank you. I look forward to more of your Pentatonix reactions. They have hundreds of videos and songs - covers and original songs. Of course "Hallelujah" is not a Christmas song but it is on one of their Christmas albums. They tend to include non-Christmas songs on their Christmas albums because they love the songs. Most of us listen year-round anyway.

Their cover of Queen’s Bohemian Rhapsody is AMAZING! Their covers of Sound of Silence, Mary Did You Know and Imagine are incredible. They won a Grammy for their Daft Punk medley. Just a phenomenal group. I suggest listening to the originals before listening to their covers, just so you can appreciate how amazing they actually are.

I was also going to say "Get More Headphones / Ear buds!", but I see others already have. It's kind of like going to all the trouble of loading up a 4k 3-D movie, then watching it with one eye closed. You're missing half of the "experience".

Other essential PTX performances: Sound of Silence, Daft Punk Medley, Bohemian Rhapsody, Mad World, Imagine, 90’s Dance Medley, Evolution of Michael Jackson, Little Drummer Boy, etc., etc…

Pentatonix has amazing songs out there:" Mary Did You Know, Bohemian Rhapsody, Say Something, Daft Punk" ~ ~ the list is endless and each song is made beautifully their own! The last solo man, Mitch Grassi has a great individual video covering the Billie Eilish song "Your Power", it's well worth checking out! The bearded guy, Avi Kaplan,second singer, has left the group and has a remarkable solo career with an eclectic mix of original work that I love! His powerful "Change on the Rise" ~ gently beautiful "Avi Kaplan, All Is Well, 7 Layers Session # 126 ~ and jamming "When I'm a Fool Live at Sunset Sound" highlight the tip of the talent this man possesses! Hope you get a chance to react to these!

Pentatonix Come All Ye Faithful is amazing

Art is easy to create, but art that lasts is EPIC

If you want to go down the a capella rabbit hole, PTX is a great place to start. The big three are PTX, Home Free and Voice Play. A fourth newcomer to the list is Bass Gang. All of them are worth a listen! Great reaction guys.

DAFT PUNK & BOHEMIAN RHAPSODY! Two more different styles of songs with strong performances and smartly written arrangements… y’all are gonna like them!

Anything PTX touches turns to gold

New Sub. Here for more PTX and Ren. Great reactions. Really can't go wrong with any of their stuff

They are all very good singers individually, but together is perfect.

You both look great!I'm a little jealous 😄 Love from Germany ❤

Get Mitch slapped. Mitch has such an incredible top end.

You should definitely check out their cover of Bohemian Rhapsody, it’s amazing!

Definitely check out Bohemian Rhapsody by Pentatonix (PTX)! They don't use instruments, and they're so clever about the guitar solos, etc!