Fans can currently support their favorite artists by buying their albums and paying crazy prices to see them live. But if Matt Smith, CEO of Royalty Exchange, has his way, there will soon be a new way to invest in artists, and yield a return. Royalty Exchange is looking to buy a 15% or 25% stake in the singer Eminem's music royalties form his 1999 through 2013 catalog. Smith explains the benefits of investing in this alternative revenue stream.