An Over-due Tribute to Back-up Singers

Saw the documentary "20 Feet from Stardom" last weekend, and it was the best movie I've seen in years.  Audience members emerge from the theater with smiles on their faces because the film lifts your spirits and makes the world look a little brighter.  It made me think how much influence the back-up singers, usually African-American women, have had on music I've listened to all my life.