The Soloist (2009)

The Soloist ~ Jr. Robert Downey, Jamie Foxx, Catherine Keener, and Stephen Root

In 2005, the only thing hurting Los Angeles Times columnist Steve Lopez more than his face from a recent bike accident was his pressing need for story ideas. That is when he discovers Nathaniel Ayers, a mentally ill, homeless street musician who possesses extraordinary talent, even through his half-broken instruments. Inspired by his story, Lopez writes an acclaimed series of articles about Ayers and attempts
to do more to help both him, and the rest of the underclass of LA have a better life. However, Lopez's good intentions run headlong in the hard realities of the strength of Ayers' personal demons and the larger social injustices facing the homeless. Regardless, Lopez and Ayers must find away to conquer their deepest anxieties and frustrations to hope for a brighter future for both of them.

http://www.imdb.com/title/tt0821642/
http://en.wikipedia.org/wiki/The_Soloist