Inspired by my shock at finding out (through the Pitchfork review) that the lead singer of the band Rhye is actually a man. I suppose listening to it with the knowledge already you may think I was being daft but on first listen I didn't even debate it in my head. So...what other instances of this are there? I seem to remember thinking the vocalist for Azeda Booth was female before I read up on them too..

Rhye: http://www.youtube.com/watch?v=sng_CdAAw8M
Azeda Booth: http://www.youtube.com/watch?v=kTLpmmcvjF0