If that's the case, then make sure that the track itself loops nicely and does not take up a lot of space. While I know .ogg has its supposedly impressive compression attributes (compared to say, .mp3), the music tracks can add up in disk space. If there isn't much of a selection to begin with though (Being that it's an RTP that should just provide the good ol' default barebones), then I don't think memory will be much of a problem though. Just saying that if, say, you had a selection as large as RMXP's RTP, then I would have to say things like creating short, loopable tracks would be a better idea. xD
Of course, I'm assuming you considered that though. o: I just want to throw it out, anyway. xD