"The test of time shows that he had a freaking secret formula that nobody has been able to emulate. Even today the music just blows you away."
S-Curve Records CEO Steve Greenberg, who worked with Stewart on "The Complete Stax/Volt Singles 1959-1968," remembers the pioneer and his groundbreaking label.
The late label chief is "an important piece of American music history," and an instigator in the Southern soul movement.