In one of my trips down the rabbit hole that is YouTube, I came across this channel. She's a vocal coach and part of her schtick is reacting to different artists. This one is her reaction to the current lead singer for Nightwish (Floor Jansen, formerly of After Forever). Holy hallucinating heifers, Batman. I have an album by After Forever and it's okay, she sounds good but not especially great on that one, but daaaayyyyyyuuuuuummmmn, she brings the pain with Nightwish. I feel like a bit of a heretic saying this, but I think she outdoes Tarja Turunen (original Nightwish lead singer). A large part of it is in how she sings in both rock/pop and opera styles and how quickly she's able to switch between them. Not just in the same song, in the same VERSE! Personally, I am not a trained singer of any kind, so I don't really know how difficult that is, but judging by how excited this vocal coach was when she heard Floor doing this, it's a pretty big freaking deal. Also, she said that most singers she knows that sing in both styles don't even attempt to do both in the same day, so it's a HUGE deal that she's doing it in not only the same song but in the same verse.
TL;DR: Mike finally heard Nightwish with their new lead singer and got REALLY excited because she outsings the original lead singer on the original material.
https://youtu.be/8iI2UFN3gSU