One limit of it will be the eboot file. If created with old sdk(for 2.50FW or so) or specific (inclunding ps1lght) the param.sfo will add this function (so you don t get the error message) but il will not work.
So as Sandungas said, it need to be tested per game.
The PSN game also allow it, e.g.: eden of child but the param.sfo will need to be updated (and so edited as Sandungas explained) from pkg (or database rebuilt)
I think it s like similar case than remote play, and i suspect some games don t have this support (either remote play or music in game) not just because old sdk or psl1ght.
May be a list of such games having music in game on the wiki?
Irrc, there are probably already a list on ps3hax.
Last edited by Ada Love Lace; 08-11-2012 at 08:37 PM.