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This month marks 40 years since the release of Purple Rain, the 1984 American romantic rock musical film scored by and starring Prince in his acting debut.
The semi-autobiographical story in the film follows a musician's rise to superstardom, and it was a huge success - Prince became the first artist to ever have the top movie, album, and single at the same time.
Matt Thorne, author of Prince: The Man and His Music speaks to Charlotte Ryan to celebrate the iconic Purple Rain.