to do this go into the world editor if you have it and you'll see a weird green box attached to the music brick and lots of weird dots flying around. click on the green box and click on the media tab, in the filename type in the filename of the music you want. eg: base/data/sound/music/Icy.ogg . and select AudioLooping2D that'll make it play everywhere and make it loop. it won't play this music until you go into the profile tab and deselect useProfileDescription. then click apply and it should play this music everywhere.
