Apple is getting into the popular music-streaming business today -- but Spotify, Google Play, Pandora and even public radio stations are already there. Although several musicians have been skeptical of the digital-music market, like Taylor Swift they're allowing Apple to stream its songs — with the potential for reaching 100 million people with iPhones. Can the company that invented iTunes persuade a generation of music listeners to actually pay? Casey Rae is CEO of the Future of Music Coalition, a nonprofit advocating for artists. He's also an adjunct professor of technology and culture at Georgetown University.