The Isley Brothers
The Isley Brothers recorded "3 + 3" in the Record Plant at the same time as Stevie Wonder was recording "Innervisions" (1973). In fact, they walked in on him recording "Don't You Worry 'bout a Thing". Both Chris Jasper of the Isley Brothers and Stevie Wonder were users of the ARP synthesizer and both worked with visionary engineers Robert Margouleff and Malcolm Cecil.