OK, he's a real rapper, but he also plays a fake version of himself as the leader of one of the dozens of lookalike Hanna-Barbera pop quartets in the "All That Jazz" episode of Sealab 2021 (first aired 28 Oct. 2001). They play "Fett's Vette," one of his early songs. So yeah, real band, fake depiction. Does it count? Why the hell not?