As one of the most popular Californian pop/rock bands of the '70s, the Doobie Brothers evolved from a mellow, post-hippie boogie band to a slick, soul-inflected pop band by the end of the decade. Along the way, the group racked up a string of gold and platinum albums in the US, along with a number of radio hits like "Listen to the Music," "Black Water" and "China Grove." The roots of the Doobie Brothers lay in Pud, a short-lived Californian country-rock band in the vein of Moby Grape featuring guitarist/vocalist Tom Johnston and drummer John Hartman. After Pud collapsed in 1969, the pair began jamming with bassist John Shogren and guitarist Patrick Simmons. Eventually, the quartet decided to form a group, naming themselves the Doobie Brothers after a slang term for marijuna. Soon, the Doobies earned a strong following throughout Southern California, especially among Hell's Angels, and they were signed to Warner Bros. in 1970.