Leslie Edward Claypool (born September 29, 1963) is an American musician, singer, songwriter, producer, author, director, and actor. He is best known as the founder, lead singer, bassist, primary songwriter, and only continuous member of the rock band Primus. His playing style on the bass is well known for mixing tapping, flamenco-like strumming, whammy bar bends, and slapping. Claypool has also self-produced and engineered his solo releases from his own studio, Rancho Relaxo. In 2006, a full-length feature film, Electric Apricot, written and directed by Claypool, was released, as well as his debut novel South of the Pumphouse. He wrote and performed the theme songs for the adult animated television series Robot Chicken and South Park.