Firstly, a little background. Grease began its life as a stage musical. Most of the songs from the film were from the stage musical. However, one of the No. 1 hits was written by Gibb for the film.

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When John Farrar turned up to a movie set at dawn clutching a demo of his hastily written “emergency song”, he didn’t have high hopes. The call had only come in the previous day, crying out for a last ...