i would have to say prince in purple rain.period.

It's not the best, but my favorite: Bowie in "Labyrinth"

Meatloaf in Fight Club (Bob with his bitch tits)

Videodrome - Debbie Harry The Running Man - Mick Fleetwood Courtney Love - People versus Larry Flint

Mick Jagger in "Freejack."

Nah,...just kidding.

Sting in "Dune." Nah...again.

Vanilla Ice in "Cool As Ice."

No...Vanilla Ice in "Teenage Mutant Ninja Turtles II."

Man, this is hard!

Cant believe no one has posted the classic Who movie; "Tommy". Sure some of it was a little weird and trippy (especially the herion robot??? that was especially strange) but pretty good flick for its time.

David Bowie in Zoolander

Peter Tosh & Toots Hibbert in The Harder They Come

Joan Jett in the Light of Day that weird Micheal J Fox movie