The Banana Splits
Mod rockers Fleegle (dog, guitar), Bingo (gorilla, drums), Drooper (lion, guitar) and Snorky (elephant, organ) hosted their own Saturday morning kids show, The Banana Splits Adventure Hour (1968-1970). I mainly remember them introducing cartoons, running into each other, and driving kick ass six-wheeled dune buggies, but I guess they must have played some songs or something, because they managed to put out an album. They got a second life as a Cartoon Network web cartoon, then were rebooted by the SyFy network as a horror franchise.
Trivia Time! While the characters were invented by NBC, they went to the Krofft brothers to design the costumes.