If you like that Igorrr stuff I recommend that you just follow the youtube rabbit hole as far as you're willing to go. I'm almost certainly going to do a Music from the Underground post about him at some point.
Oh, and if you're willing to get really crazy, his old band has this song you might appreciate.
Also, I don't know if it counts but King Diamond isn't too far removed from opera.
And, I mean, his album, "Them", could easily be turned into an opera.
Those YouTube rabbit holes go deep. You've given me lots to follow, and I think you.
Now I know what I'm doing tomorrow!
Haha, I think I'll probably be joining you, there's some stuff in your post and in the replies I haven't heard so I'm going to have to check that out.
Thanks for making such a good post by the way. And also, thank you for sharing that Barbara Hannigan video, it's something I've not seen or heard before and it fascinates me.