In 1991, The Complete Stax/Volt Singles 1959-1968 cataloged one of the most prolific runs in soul music history by collating 244 songs on a now-legendary and long-since out-of-print 9-CD set. 33 years later, Rhino kicked off the first-ever vinyl release of The Complete Stax/Volt Singles 1959-1968 by unveiling Volumes 1 and 2 on vinyl, much to the delight of collectors worldwide during 2024. Today, this robust series continues with the arrival of Volumes 3 and 4 on vinyl.

The name Perpetual Groove indicates a stylistic form for the veteran jam band. You hear the name and imagine long songs segueing through jams from one to the other. In a sense, Perpetual Groove could define many jam bands, but with PGroove, you get the name, and an assortment of various musical tastes and styles that careen from the stage like a robotic factory on overdrive.