A passionate recommendation:

20 Feet From Stardom is a current documentary about backup singers.  I found this film moving, inspiring and insightful, both for the music story, and as a metaphor for many life aspirations.  (Goosebumps, teary eyes, don’t-I-know-it laughter.)  I’ve seen it twice and would see it again.  I urge you with enthusiasm – if it comes to your area, go!  Here’s a list of cities where it’s playing.