Mordecai and the Rigbys
Two-man (well, one blue jay, one raccoon), two guitar band featured in the eponymous episode of Regular Show. They have shirts before they learn songs. Thanks to a spilled soda and a gramophone-based time machine, they learn to rock from their future selves, who are successful musicians with British accents. But then they find that their future selves are just lip-synchers. Mordecai breaks up the band, keeping his integrity while losing the girl. Rock be a cruel mistress, my bird friend.
Other names considered during the band's formation: Cool Dudes, Face Punch, Ren's Trek, Helicopter Crash, and Mustache Cash Stash. We agree with Mordecai--should have used the last one.