The Bee Gees weren't originally a part of Saturday Night Fever, but when "You Should Be Dancing" started taking over the airwaves in the summer of 1976, the producers decided they should create the film's soundtrack. The Gibb brothers wrote the songs in a single week at a studio in France, having little idea that the music would change their lives forever. The movie became a huge hit, but the soundtrack became an absolute global sensation. Three songs hit the Number One spot, but it was "Stayin' Alive" that went on to become the most famous song of the disco era. It made the group millions, but also embalmed the band in the disco era, and it became very hard for them to move on once the craze went away.