Griffin says those fees could create a pool as large as $20 billion annually to pay artists and copyright holders. Eventually, advertising could subsidize the entire system, so that users who don't want to receive ads could pay the fee, and those who don't mind advertising wouldn't pay a dime.
"Ideally, music will feel free," says Griffin. "Even if you pay a flat fee for it, at the moment you use it there are no financial considerations. It's already been paid for."