After giving up a boxing career, Hagar began singing in the late '60s, performing with various California bands including Skinny, the Fabulous Catillas, Justice Brothers, and Dust Cloud. During this time, he built up a solid reputation in the California hard rock scene. Former Edgar Winter guitarist Ronnie Montrose asked Hagar to join his band, Montrose, in 1973. Hagar recorded two albums with Montrose before going solo in 1976, taking the group's bassist, Bill Church. Montrose's drummer Denny Carmassi later joined Hagar's band, along with keyboardist Geoff Workman.