http://www.rottentomatoes.com/m/20_feet_from_stardom/#
If you haven't seen this movie, it's well worth it, with Stevie Wonder and Susaye Greene interviewed and Michale Jackson's backing singer Judith Hill featured. It's all about the backing singers, but alas, despite a tantalizing opening sequence, including vintage pictures of the original Vandellas, and original Supremes Mary and Flo, their stories were not told, nor were the Andantes featured. But is was engrossing, and moving. It's on Netflix now.