Hello again. Today you met for the first time Tarja Turunen, the first soloist of the band (between 1996 and 2005). Her vocal style is predominantly classical / operatic with Gothic accents, which I think caught your attention. By the way, as other fans have told you in the comments, Nightwish uses audio tracks recorded with choirs and symphony orchestra, so your hearing did not deceive you.

Nightwish work to a pre-recorded backing track. Pre-recorded by the London Philharmonic Orchestra, The London Metro Voices Choir and the London Young Musicians Children's Choir. This was their original singer Tarja (Tarya) Turunen, their 2nd singer was Anette Olzen and Floor Jansen is their current singer. Tarja was Opera trained

If you wanna see more music videos with this singer Tarja, check out Bless The Child or Over The Hills And Far Away. On the chorus, you have Tarja, Marko, and a choir with lots of layering.

A bigger symphonic metal band like Nightwish, will use some backup track, as they work with symfonic orchestras and choirs, thats imposible to bring on tour.. well i guess you can, but that would cost a lot..lol but they bring all they can with band members, as live as posible..

Yeah, it's hard to tell who's who in this group from get-go. In this video original vocalist and one of founders of Nightwish Tarja Turunen sings. Band recorded most songs and albums with her. This album was recorded with a choir, which you have heard. On earlier albums opera choir effect was created with Tarja's vocals. This is not a difficult task for her, as she has studied choral and church singing and classical vocals.

Nightwish in its first era together with the singer Tarja Turunen was more metal, like a rock opera, after the arrival of Anette Olzon, the style changed, we heard more folk elements, children's choir and more orchestral elements. With the arrival of Floor, the band anchored for good in orchestral sequences and the original style is no longer heard. So it can be divided into three eras.

I wonder who is suggesting these Nightwish performances to you. S/he must be out of touch with their best live performances, like those at Wacken 2013, Wembley Arena & Tampere 2015 just to mention a few.

Hmm.. You're making rather odd choices with these Nightwish songs.