This forum really is full of ageing rawk fans, isn't it?
Seriously, some good choices and less so, but how about:
James Brown - surely the greatest front man ever, bar none?
Steve Marriott (Small Faces)
Steve Winwood (Spencer Davis Group, Traffic)
Arthur Lee (Love)
(The Crazy World of) Arthur Brown
Fela Kuti (numerous bands)
Debbie Harry (Blondie)
David Byrne (Talking Heads)
Siouxsie Sioux (Banshees)
Robert Smith (The Cure)
Morrissey (The Smiths)
Kim Deal (Breeders, Pixies)
Tom Barman (dEUS)
Thom Yorke (Radiohead)
Dick Valentine (Electric Six)
Karen O (Yeah Yeah Yeahs)