What? Islaja definitely sings in Finnish, in this song and most of the time at least.
quite interesting...which bands? magma, Sigur Ros?
Quite a few people have done that. Off the top of my head, I can think of 4 bands/artists who've done that, starting with Magma in the early 70's.
she isnt actually singing in finnish, she just made up language like noises.