Does Prince really have thousands of unreleased tracks hidden in an underground vault? Mobeen Azhar travels to Minneapolis to find out the hidden chapter of this man’s story.

Does Prince really have thousands of unreleased tracks squirreled away? And what do they sound like? Many of us know the pop Prince - the androgynous, 'Little Richard' caricature that sings about sex and spirituality in the same breath. But deep underground in the city of Minneapolis, there is a hidden chapter of this man’s story.

This is a journey into the whirlwind creative impulses which animate one of pop music's most respected figures. Mobeen Azhar visits Paisley Park, Prince's recording studio and talks to musicians, protégés and engineers who portray Prince as a modern day Mozart with an unrelenting urge to make music. Composer Brent Fischer and protege Cat share details of their favourite songs from the vault. And, sound engineer Susan Rogers provides rare insight into why a lot of that material remains unreleased.

We hear from band mates Sonny T, Michael Bland and Eric Leeds about Prince’s creative process and about what some of the unreleased material actually sounds like. Manager Alan Leeds tells us why the vault is believed to have been leaking songs onto the black market for over a decade and how the music in it could be an important part of Prince’s legacy, for decades to come.

Producers: Ben Carter and Mobeen Azhar

(Photo: Recording artist Prince performs during the Billboard Music Awards 2013. Credit: Ethan Miller/Getty Images)