PlayStation Music (or actually "Music unlimited" as it was called) was the only music application able/allowed to run in background while a game was running. Ot

PlayStation Music (or actually "Music unlimited" as it was called) was the only music application able/allowed to run in background while a game was running. Other (hobbyist) music players are not allowed, likely because it would make the available resources to a game less predictable, so harder to optimizer for the console... As many others, Sony found later that it's not worth it to operate a own streaming service, and probably made a deal with Spotify where Sony provided the initial application, Spotify provided the service and potentially pays some additional revenue share to Sony. It's a story from a moment in time where every distributor/company thought they could do a better/more profitable music streaming service than Spotify...