N-Trance are a British electronic music group, from Oldham, Greater Manchester, who were formed by Dale Longworth and Kevin O'Toole, in 1990. The group has sold over 5 million records worldwide and some of their hit singles include "Set You Free", "Forever", as well as covers of the 1970s disco songs "Stayin' Alive", "D.I.S.C.O." and "Da Ya Think I'm Sexy".   Wikipedia