BBC reporter Mobeen Azhar was intrigued by stories that Prince has a vault containing hundreds of hours of unreleased recordings, and he flew in to Minnesota to investigate those tales. How much unreleased music does Prince have? Why isn't he releasing it? Is there any reason to think that he ever will?

In a 51-minute audio documentary, Azhar talks with several people who have collaborated with Prince over the course of his long career, and tells the story of Prince's conflicted relationship with the recording industry. Does Azhar, in fact, find the legendary vault? You'll have to listen to find out.

Hunting for Prince's Vault can be heard via the BBC World Service here.