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Acid house is a variant of house music characterized by the use of simple tone generators with tempo-controlled resonant filters. It began when musicians discovered that they could create interesting sounds with the Roland TB-303 analogue bass synthesizer by tweaking the resonance and frequency cut-off dials as they played. The term "acid" was used in Chicago at the time as a term for the squelchy "acid" sounds of such bass synthesizers such as the TB-303. When Genesis P-Orridge visited Chicago in the late 1980s, he checked out acid house music, thinking at first that "acid" referred to LSD. He brought the sounds back to England and began developing with his band Psychic TV a more psychedelic sounding acid house music, including samples from 1960s exploitation films, from Timothy Leary, etc. Acid house music became a central part of the early rave scene in the U.K., and the yellow smiley became its emblem.
See also: Madchester, acid house party