let's face it: demi simply has a voice that is out of this world!!! she sounds just as amazing in her live performances as she does on the album!! :))

Even though their relationship didn't work their voices still blend perfectly

Joe and Demi's voices together makes me feel like I'm in heaven. It's sooooo good :)

i love how kevin sings along with joe. and nick is very enjoying what he's doing, it's so intense. they're all very cute, nad great singers. i'm so obessessed with this song!

How anyone has the guts to say Demi can't sing hasn't seen this or her hundreds of live performances. She is flawless! I know she mixed the words up but that's Demi! She just carries on like a pro. I'm thinking they hadn't performed this song much at this point.

demi's vocals are so powerfull!!

I find it unbelievable that i cant watch a video of Demi without haters commenting on it. She did great in the performance. & in all of her performances. Leave her alone. Stay strong, Demi. We love you.

I know this was a while ago, but Demi CAN SING. Even now. I think people under estimate her, thinking she's just another singer from Disney but she's much more than that.

demi's voice sounds freaking amazing and she puts so much emotion into it.. love it.

Her vocals are just amazing!!!

Demi sounds the EXACT same live as she does recorded ! She is the epitomy of AMAZING !

Miley & Nick 's voices go perfectly together and so does Demi & Joe :D

DANGGGGGG! They're freaking amazingly talented! Especially at the end!

Demi is amazing live!! hit all the high notes!! Same goes for Joe, pure talent

1:51 lol man I just love demi lovato, what I also love about demi is that she shows us that celebrities arent perfect either

i love this song n i love demi's singing. she has an amazing voice.

Best singers! They both litteraly killed it !

DEMI IS INCREDIBLE! I LOVE HER #LovaticForever #TeamJonas

This is the best performance of Joe in this song live I mean, well for Demi it goes without saying that she was fabulous!

This whole performance is just precious...

Oh gosh! I love her so much! Demi, so good voice! I ve always known you can sing... and joe is so good in here!

demi is so incredible, her voice is so powerful wow :)

I wasn't a fan of them dating but I can't deny that their voices were perfect together.

I had no idea Demi can sing sooo good live! Many people say Dei can't sing but they are sooo wrong... they're idiots. I LOVE DEMI!!!

she is so amazing.

i think this one is the best one they have ever sang together and it sounds better than the actually record

i love her voice is amazing!!

Love it! They sang perfect!

I get chills every time I hear this song.

JEMI u r amazing..

even when she messed up joe just looked at her with his eyes and said its ok keep going gosh i love them!

This was an amazing performance

great performance! demi sure sounds great live.

I really love it when joe says, "when im yes shes no!" :D he sounds so cute!

That's a great video. Demi and Joe look beautiful together.

They do sing well together! (:

the sooo beautiful together.........they shout be cople again!!

At that time demi was starving herself and without eating and stuff she still sang HER VOICE IS PERFECTION

i love them both ! their chemistry is great !

DUDE. Demi is so amazing.

adore this song

They sang it so well i didnt even notice!!!! had to go back and look lol

this is absolutely...like, wow, i can't even find words. holy crap.

I love Joe's hair here!!!!!!!!! Haha.

i honestly miss all of this so much.

1:52 demi:but i cant... joe:but your the harmony lol

perfect harmonies

she is an amazing singer damn she can sing

this is the reason why i love demi

i love demi and joe ..

i miss them so much

Demi, perfecccctttt, amaziiinnngggg

3:05 Demi's belting it out so high and joe attempts it buts like screw this I cant harmonize that high hahe LOVE YOU GUYS

PERFECT COMBO!!!

This is so perfect...

i like this song a lot Deami and Joe Jonas are great voice i like it

haaahhhhhh~ i love this song!!!! good job Demi! :)

Soooo perfect !!!!!!

DAMNNNN vocal powerhouses!

omg really good!! i love u demi!

OMG this is live they sing freaken good

i want them back togehther soooo badlyy

damn gurl, you have an amazing voice, there vocals toghther are amazing

WOW tht was awesomeeeee

Wooh, she killed this :D

respect pentru vocile lor live

love nick jonas on drums his is great at drumming and joe jonas is a great singer and demi lovato is a great singer to

2 years unbroken

demi messeeddd uuppp!!!

Kevin's just rocking out

jemi omg

She try to dont look at him. She was, is and will be sooo strong. Lovatic for a life !

They are the harmony to every song the other sings. Demi sings so good. I wish I could sing like that. She messed up. But that's good cuz I was starting to think that she was lip-syncing. She sings the same whether recorded or not. SHE'S AMAZING. He was good, too.

i guess it's a compliment when people who don't listen closely think that this isn't live. it's kind of cute actually haha

Amazing!

haha 1:52 demi messes up and she smiles she so cute!!!!

ALL DEMI FANS LISTEN UP.On August 20th, let's give Demi an amazing birthday present she can never forget. Watch "SKYSCRAPER" on VEVO at least once and try to get her the most watched video of the year for the most inspirational song of our lives. Copy and paste this to her other videos and thumbs up this comment so we can get the word around. WE LOVE YOU DEMI AND WE'RE SO GLAD YOU'RE BACK AND HEALTHY! Love You Demi And Too Me U Were Never Gone..Love U Always Be A Fan

Demi sounds so good

wow..D.....De.....Demi is amazing!....wow :O:O

Without demi this duet would be NOTHING

2:30 Kevin sings ahaha so cute !

out of all the hair colors she has had i like this one the best!

wow demis amazing

Mines too she helps people through struggles!

WOOOW its amazing =)

omfggggggggggggg she sounds just like the record DAMN SHE CAN SING!

are you sure she wasnt lip synching? CAUSE SHE SOUNDS THE SAME LIVE AS SHE DOES RECORDED. i didn't think it possible to have so much talent. LOVE YOU DEMI stay strong!!!

they sound great.. =D

JEMI JEMI

when Demi mistakes the lyrics and Joe sings it right and they smile at each other and Joe looks at her like "its okay"... I loved them together tho

Demi i really like this video

Jemi ♥

i dont care what anyone says demi has the most amazing voice in the world. i would never compare her to artists that are signed to disney because her vocal range is so much higher then theirs and even though their are artists out there like mariah carey and leona lewis that have amazing vocal range i would prefer listening to demi because her voice has a nicer sound to it.

demi is really a star quality. she is amazing at live and studio. for the age she was that time i think she's crazy awesome. i prefer her much more than Carly Rae Jepsen singing live. if i can say her live singing is not as good as the studio version. if you agree thumbs up!

que bonito se veian junos cantando se ria bonito verloz otra vez cantando juntos pero como amigos nnnnnnnnnnnnnnnnnooooooooooooooo o ssssssssssssssiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

Its at the 1:50 mark.... She starts to say "but i wouldn't change a thing" instead of "you're the harmony to every song I sing." She catches herself right away when she realizes Joe is sing a different lyric... You can even tell she gives a little smile like whoops.

it IS possible to sing perfectly, ive seen singers do it. but of course it is agreeable that humans make mistakes... and demi was amazing here!

i love how she picks up joes slacking of vocals...not his best...she was amazing like always

By perfectly I meant that they can't sound exactly like the studio version, but they can sound almost similar. And yeah, I agree - Demi was amazing here :)

J E M I