As far as movies portraying the music profession accurately....I've got a few faves.
The Fabulous baker brothers......they nailed quite a few aspects of the biz.
One Trick Pony....boring, but the music parts were pretty accurate.
'Round Midnite.... scary real.
Let's Get Lost......really scary real.
Spinal Tap.....almost everything was believable if you've been on tour.
Haven't seen the Woody Allan flick about the guitarist yet (forgot the name) but a lotta musicians seem to like it.
My least fave moment from a sports movie? William Bendix attempting to look athletic in The Babe Ruth Story. If it's possible he was even worse than John Goodman in the re-make.