Why should you see a documentary about backup singers? One look at the electrifying 20 Feet From Stardom and youll have the answer, that is, after you stop cheering. Lend your eyes and ears to the likes of Darlene Love, Merry Clayton, Lisa Fischer and Tata Vega, and get ready to revise your definition of what a star is. Director Morgan Neville and producer Gil Friesen (the A&M Records exec who died last year) have rightly gone into the shadows to shine a light on sheer perfection. Mick Jagger, Bruce Springsteen, Stevie Wonder, Bette Midler and Sting all bear witness and theorize about why that 20-foot leap to the star spot didnt happen for these unsung divas. Sometimes its racism; sometimes bum luck; sometimes its producer Phil Spector putting Loves voice in another singers mouth. You watch. You hear the gospel spoken in the voices of these women. And you marvel.