[2] Warren was also a session musician for Motown records in the early to mid-1970s and played on numerous albums.
He started to play guitar at twelve years old, and at the age of seventeen, he was discovered by Norman Whitfield of Motown Records.
Warren appeared with the band Pacific Gas & Electric in 1972 on the German television show Beat Club.
He also claims to have performed the famous guitar solo on Funkadelic's song "Get Off Your Ass and Jam".
After quitting Motown in 1975, Ray Manzarek of The Doors employed Paul as lead guitarist for his new band Nite City.
The day after quitting Marx's band, Warren went out on the road to work as lead guitarist for British singer Joe Cocker.
In late 2010, he released his first solo album in over a decade entitled Round Trip with his own band.