Beyoncé's album cuts, one-offs and collaborations offer an even richer portrait of the R&B megastar and her influences. Her debut solo single, “Work It Out”, recalls the skeletal, forceful funk of Betty Davis; the knowing “Schoolin' Life” throws it back to the ‘80s with old-school synths and horns; and her faithful version of Dreamgirls' title track pays tribute to her girl-group ancestors.