LFO is an English techno act on the Warp Records label. LFO were pioneers of the bass-heavy techno music of the late 1980s to mid-1990s. Originally, the group was composed of Gez Varley and Mark Bell. LFO is now Bell alone.The group's name is derived from the abbreviation for the term low-frequency oscillator, a synthesizer function widely used in electronic music.The song "Freak" was used in the 2005 film Hard Candy and in the 2010 film Enter the Void.In 2009 the Warp20 (Recreated) compilation featured covers of two early LFO songs, "LFO" by Luke Vibert and "What is House? (LFO Remix)" by Autechre.In late 2010 it was announced that LFO will be appearing at the Bestival Music Festival in Isle of Wight (Between 8-11 September 2011).