Underworld is a British electronic group, and principal name under which duo Karl Hyde and Rick Smith have recorded together since 1983, though they have also worked together under various names both before and after adopting the Underworld moniker. The band is perhaps best known for "Born Slippy .NUXX", a track made popular in the Danny Boyle 1996 hit film Trainspotting. The first two albums they recorded together were with the band 'Freur'.