William Cullen Hart was an American musician, singer, songwriter and visual artist. He was a co-founder of the Elephant 6 Recording Company, as well as the rock band the Olivia Tremor Control. Following that band's breakup, Hart and several other former members regrouped to create Circulatory System. Hart's music was characterized by its blend of indie rock, Beatlesque psychedelic pop and musique concrète.