My pick would be AMERICAN HARDCORE.
As a lifelong music freak (and former employee of WNEW-FM NYC, the world's GREATEST rock station ever) it moved me in ways no other film has. I always thought punk rock was noise, but this film really got me into the artistry of it, the characters involved, and after I watched it, I bought more songs on iTunes than I had in a long time by bands I never knew much about-Bad Brains, Dead Boys, Minor Threat, etc.
Most touching of all was the story of how Johnny Ramone stole Joey's girlfriend and married her-it was a scar the shy/sociall awkward Joey carried with him until he died-really showed that these artists are dimensional and above all, very human. I couldn't recommend this film more highly.....