Semi-Autobiographical Films in Which Musicians Play Thinly-Veiled Versions of Themselves: A Poll

Pete Townshend's White City: The Music Movie might qualify. He plays a musician named "Pete," and is referred to by another character as "yer famous friend." It's basically videos/performances of the White City songs interspersed with dramatic sequences, but it works fairly well. Only released in 1985 on VHS and Laserdisc, never reissued.

https://youtu.be/7iFtg4JFgzE