Catherine Keener has signed on to co-star with Jamie Foxx and Robert Downey Jr. in DreamWorks' music feature "The Soloist" reports Variety.

The story centers on Nathaniel Ayers, a homeless musician with schizophrenia who dreams of playing at L.A.'s Disney Hall.

Downey Jr. will play Lopez, who found Ayers (Foxx) on the streets of downtown Los Angeles. Keener will portray Lopez's wife.

The screenplay, by Susannah Grant ("Erin Brockovich"), is based on a 2005 series of articles by Los Angeles Times columnist Steve Lopez.

"Atonement" helmer Joe Wright will direct starting in January.