Rosemary Butler began her career playing bass and singing in an all-girl band named the Ladybirds. The band appeared on several LA area television shows before opening for the Rolling Stones in 1964. She then joined all-female hard rock band Birtha who released two albums for Dunhill Records. After they split in 1973 she became a popular back-up singer in the late 1970s and early '80s. Her vocals were featured on Bonnie Raitt's album, Sweet Forgiveness, on songs "Gamblin' Man", "Runaway", "Sweet Forgiveness", and "Two Lives."