Firmware 2.40 introduced in-game music playback to the PS3. However, it can only be used with compatible games. You can play your own music by pressing the PS button in game and selecting a track, album or playlist from the [Music] menu.
If the game does not support in-game music playback, you will see a error message
Do you know what games currently support the in game music for ps3?
i want to play music during playing games on ps3