Purple Rain
(1984)

It's only when the Kid (Prince) is about to get dumped by his musicians, who are fed up with his overwhelming ego, and when his father (unsuccessfully) attempts suicide, that, he decides to listen to Wendy and Lisa's song.

The movie reaches its climax when the Revolution performs "Purple Rain" in front of a stunned audience.

The Kid becomes a star and reconciles with Apolonia.  

Thanks Mirko!