Les Claypool is a singer and bassist. He is best known on South Park as the singer of the South Park Theme, composed by PRIMUS. He and PRIMUS also recorded "Mephesto and Kevin" for the Chef Aid: The South Park Album. They also created the theme song for the "[adult swim™]" show "Robot Chicken™". Les Claypool has also done other theme songs, Les Claypool also does the only lyrics in the song, being the phrase "It's Alive!" during the song, which is a reference to Frankenstein.
Claypool is visible in the original South Park intro, where he is shown walking through the town of South Park, singing and playing an acoustic bass guitar. PRIMUS appears in "Chef Aid" as one of the performers helping out Chef. At the Chef Aid concert he says that PRIMUS are proud to support chef, and that in the early days of PRIMUS, chef told them to keep trying and keep pursuing their dreams, no matter how much they sucked. Which is a reference to a PRIMUS slogan known as "PRIMUS Sucks!"He hasn't been shown in the intro since Season Four, as the intro was remixed for "Fourth Grade", but he still sings the theme song, which has been remixed three times: originally for "Fourth Grade"; a country-like remix used at the beginning of Season Six and ending in mid-Season Ten; then remixed from there, using the song "Whamola" from Frog Brigade's 2002 album, Purple Onion.
Aside from the intro, he has appeared a few times in the show itself; otherwise, he is not referenced in any way whatsoever. He is one of the few celebrities that has not been parodied.
Claypool's appearance on the show is distinct, his South Park counterpart is typically shown with a red long-sleeved shirt with white stripes, blue jeans, purple socks, and blue shoes. He also wears a white hat with a yellow trim, sunglasses, and he has facial stubble.