bonnie tylerhttp://www.youtube.com/watch?v=840B27zYfOkamanda
Daughty - Poker Face (acoustic)http://www.youtube.com/watch?v=bqT4VnnEU0M
Apocalyptica - I dont care w/Adam Gontier from Three Days Gracehttp://www.youtube.com/watch?v=BnmnFTNXukY
Sarant, the one link you posted in your first post with the blonde singer.. she is singing with Apocalyptica. They are the chello players you see in the video..
Slipknot - Psychosocial http://www.youtube.com/watch?v=NrO83v6X8lI