First off, I'm a sucker for music! There have been many other instances where superheroes (or any form of action team) had the guts playing music. You had...
The Kid Super Power Hour (NBC 1981-82)
GI Joe (see episode Cold Slither)
The Flash (see episode Child's Play)
Teenage Mutant Ninja Turtles (Coming Out of Our Shells stage show)
But what started it all, The Impossibles! When the Impossibles weren't fighting off villians, they were the singing Impossibles (liked their 60's style music). They were the hottest H-B music trio until Josie, Valerie & Melody came along. If you saw the Way Outs episodes on the Flintstones, you might even say that they\'re Multi Man\'s prehistoric ancestors!