I'll start with two of my favorites- "Shine" (Geoffrey Rush) and The Pianist (Adrien Brody).
I actually liked
The Pianist, though it's probably one of the most unpleasant movies I've ever seen.
Shine was very well-made and well-acted as a movie but my appreciation of the Helfgott story stops there. After learning about how exploitative and manipulative Helfgott's quack astrologer wife was in putting that movie together and engineering his publicity campaign, I'm not sure I can enjoy that film again unless I pretend that it's total fiction. It's not about piano, but
The Red Violin was a rather interesting flick. It wasn't all that good, but it did keep my interest for a little while. The way music has to be represented to garner the public's interest (intertwining it with mental illness, murder, or genocide) makes it hard to take Hollywood's treatment of classical music all that seriously. I would nominate
Mr. Holland's Opus as one of the better ones out there, since it actually frames a lot of truths about music in the public and has a much more down-to-earth quality, despite its numerous syrupy moments.