Well, here's my list of movies I enjoyed that involve either a fictional being-in-the-band storyline or documentaries. Some of the movies I list may be ridiculous, but I seriously don't really care
Wayne's World 1 & 2
Josie & the Pussycats
Alvin & the Chipmunks
School of Rock
Metallica: Some Kind of Monster
Hustle and Flow
Alright, that's all I can think of for now. Would love to hear from the rest of you!