I was looking at some live performances of Skálmöld on YouTube. The main singer sometimes does these very low screams, like here at the 6:00 minute mark:
https://www.youtube.com/watch?v=yAyFyEFoZvs

Suddenly I remembered seeing a live performance of some song (no idea what kind of song, but for as far as I know it was an Icelandic song as well) and during this live performance there was some gothic/metal girl standing somewhere in the background. She was wearing some very tight, black clothes and I think she was wearing those black bracelets with metal around her wrists and she had black hair.

Then, maybe somewhere halfway the song, the camera suddenly turns to her and she opens her mouth. A very deep and low scream is coming from her mouth and you think: "What the Hell? Is this sound coming out of this girl's mouth?"

I'm trying to remember what kind of song this was, but I really can't remember. Like I said, I think it was something Icelandic. So, that's the reason I'm asking here. Does anyone know what I'm talking about?