What's the greatest soul music label of all time? With all respect to Philadelphia International Records, which places a strong third, the battle royal ultimately comes down to Motown - Berry Gordy's Detroit hit factory that achieved its goal of becoming "The Sound of Young America" - and Stax, the Memphis label that made stars out of Otis Redding, Sam & Dave, Isaac Hayes, the Staple Singers, Wilson Pickett, and many others.