Carol Kaye is an American musician, who is one of the most prolific and widely heard bass guitarists in rock and pop music, playing on an estimated 10,000 recordings in a career spanning over 50 years. Kaye began playing guitar in her early teens and subsequently performed regularly on the Los Angeles jazz and big band circuit. She started playing sessions in 1957, and through a connection at Gold Star Studios began working for producers Phil Spector and Brian Wilson. After a bassist failed to turn up to a session in 1963, she switched to that instrument, quickly making a name for herself as one of the most in-demand session players of the 1960s, playing on numerous hits. She moved into playing on film soundtracks in the late 1960s, particularly for Quincy Jones and Lalo Schifrin, and began to release a series of tuition books such as How To Play The Electric Bass.