You know those music documentaries they have on BBC4 on Friday nights? This is better than any I can think of.
Disclosure: I'm a sucker for this kind of thing.
The music - especially when backed by the Swampers - is amazing. And did you know Aretha Franklin's band on her best songs - such as R.E.S.P.E.C.T - was white! Knock me down wiv a fevva...
I found it on Netflix, where it snuggles alongside Ben's fave, Beware of Mr Baker ;-)
I'm going to watch it again real soon now.