Forgotten Rock Stars

There's a new Oscar nominated documentary - http://twentyfeetfromstardom.com/ - out soon. It's about various back-up singers etc who were never properly credited at the time, some examples of which are below:

I haven't checked but I hope Clare Torry gets a mention for her work on Great Gig in the Sky.

Could definitely make a Headbang theme about this - any other suggestions for this?