In no particular order...

Robert Plant (Led Zeppelin)
Billy Corgan (Smashing Pumpkins)
Brian Johnson (AC/DC)
Freddie Mercury (Queen)
David Gilmour (Pink Floyd)
Nic Cester (Jet)
Thom Yorke (Radiohead)
Bono (U2)

I haven't been listening to much rock recently, so I'm kinda out of it. >_<