Selle v. Gibb
The Bee Gees.
Selle's version of the song was never publicly distributed, but the Bee Gee's version was a single on the Saturday Night Fever Soundtrack. That album was the best-selling soundtrack of all-time until it was beaten out by The Bodyguard in 1992, with over 25 million copies being sold. You can listen to both versions of the song here, as well as see a video clip of the scene in Saturday Night Fever where the Bee Gees' song was used.