Hard to say. Probably
Kids Are Alright or
A Hard Day's Night (though my favorite Beatles movie is the animated one; the one about the submarine, and I think that Help! gets better with time).
Woodstock always gets me; it's like being there, but without having to stand all those smelly lazy hippies in person (

). I like
Don't Look Back , but who doesn't? (BTW, D A Pennebacker is receiving a honorary Oscar this year.) Even though it isn't ROCK per se,
Hair is one of my favorite movies of all time.
I strongly believe that, in spirit,
Goodfellas is the best rock movie of all time. In spirit, because as far back as I can remember, I always wanted to be a gangster. Besides, consider the soundtrack. Stones, George Harrison, Cream, etc. First time I ever heard the "Layla" coda. In recent years, I enjoyed tremendously
24 hour party people ; be sure to check it out, if you like Joy Division and british humor.
I'm interested in watching
Tonite let's all make love in London (1967). I've heard some good things about it. There's some Stones content there; also Michael Caine, Pink Floyd, Eric Burdon, etc. Here it is. I'll probably watch it later....
http://www.youtube.com/watch?v=_gUCtUWqYbc