Les Claypool

Leslie Edward "Les" Claypool (born September 29, 1963) is an American musician and writer, best known as the lead vocalist and bassist in the band Primus. Claypool's playing style on the electric bass mixes tapping, flamenco-like strumming, whammy bar bends, and slapping. He is widely regarded as one of the best rock bass players of all time.

source: Wikipedia