If you haven't, hunt down the film Standing in the Shadows of Motown, now out in select locations--very select, as in, one theater in all of Atlanta. It's worth the drive. It's worth a lot.
These were the men responsible for the Motown sound--responsible for MORE number one hits than The Rolling Stones, Elvis, The Beatles, and the Beach Boys combined--and I bet you can't name them.
They called themselves The Funk Brothers.
Go See It. Then buy the Soundtrack.