Motown’s lavish biopic of the ill-starred life of Billie Holiday has Ross performing Lady Day’s standards and re-enacting Holiday’s spiraling out of control. The only thing keeping her from the brink is the man who loves her (Williams, at his most silkily sartorial). As Piano Man, Holiday’s accompanist and confidante, Pryor is tremendously empathetic, presumably drawing upon a deep well of experience with addiction and hard times.