"I think over 70 percent of the music we've worked on for Prince is yet to come out," composer Brent Fischer recently told The Guardian. Sometimes those songs even leak — something those close to Prince suspect might actually be the artist's own doing: 
 
 Alan Leeds, Prince's former manager and president of his Paisley Park label, says the leaks were likely Prince’s fault, and might even have been deliberate. “We actually organised a federal investigation but we never got it down to one source. Prince gave the combination to the vault door to way too many of the staff at Paisley, in my opinion. He was careless. I remember driving Prince to the airport and on the way back I saw there were tapes in the glove compartment, tapes under the [sun] visor, tapes in the back seat. He would ride around listening to his unreleased music and just leave things all over the place.” 
 
 Was he leaking stuff himself? Sonny Thompson, Prince’s childhood friend and bass player at various points over the last 25 years says: “He could put out music for the next generation and it would still be relevant. "I don't think you'll ever get to hear everything in the vault because you'd have to sit down for 10 years.
– Prince may have ascended to a higher plane Thursday, but that doesn't mean the world will never again hear new music from the superstar. The Week references Prince's "mythical vault" containing hundreds to thousands of unreleased songs. And Billboard states the prolific musician's "infamous 'vault' of recordings has become the stuff of legend." Back in 1996, the New York Times reported Prince had "at least a thousand" unreleased songs. And last year, composer Brent Fischer told the Guardian "over 70% of the music we've worked on for Prince is yet to come out." So exactly how much unheard Prince music is left (provided he didn't burn the vault's contents as he once said he planned to)? We may never know. "I don't think you'll ever get to hear everything in the vault because you'd have to sit down for 10 years," friend and bass player Sonny Thompson tells the Week. "There is just too much to go through." (Check out some of the other major stories and tributes flooding the Internet in the wake of Prince's death.)