Unlike Movies and TV, music has a much longer long tail. People care less about availability of old(er) titles on a video streaming service. That's why Netflix

Unlike Movies and TV, music has a much longer long tail. People care less about availability of old(er) titles on a video streaming service. That's why Netflix is still chugging along, mostly powered by new content alone. With music it's more complex. While most users are covered by 10k songs or so, you still need to have your Pink Floyds and Beatles and Rolling Stones and Grateful Deads and Luis Armstrongs and... And neither of the Big Three has all of them. But I wouldn't be surprised if they tried to get into the streaming game.