The Bee Gees' 'Stayin' Alive' is the definitive anthem of the disco era, but it has a surprising medical use. The song’s tempo of 103 beats per minute (BPM) is the perfect rhythm for performing chest compressions during Cardiopulmonary Resuscitation (CPR). The American Heart Association has long recommended that people hum the song to maintain the correct pace of 100–120 compressions per minute. The song was written for the 'Saturday Night Fever' soundtrack and became a global number-one hit. The famous drum beat was actually a loop created by the band because their drummer was absent for the recording session; they took two bars of a drum track from another song and looped them manually on tape. This accidental innovation created the hypnotic, driving rhythm that defined the song and the entire disco genre. It remains one of the best-selling singles of all time.