You have to signup to Sony's music service and purchase from their, but Shuhei Yoshida is currently aware of the people that wish to use their own MP3 on their PS4, and doing something about it. I suggest you check his Twitter; he's very vocal within the Sony community.
Hopefully they do something about it. It would probably seal the deal for me. The only other thing keeping me from fully wanting a PS4 is that some of my friends wont switch from Xbox.
Did they allow users to stream their own music on the PS3?
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