I am picturing guys like Jimi Hendrix, Robert Plant, Iggy Pop, Peter Gabriel while in Genesis, David Byrne while in The Talking Heads (particularly in albums such as Remain In Light and Speaking In Tongues), Ian Astbury while in The Cult, Wayne Coyne of The Flaming Lips, most certainly extreme characters like GG Allin, or Wendy O. Williams of The Plasmatics.