May have been a little unclear on the subject. It might be possible to write a mut that could change the order of the songs or use a new playlist (though the new music wouldn't be heard by players that don't have it, would save having to overwrite music though), if that's what you meant.
Music (.ogg) is already a container (ogg is the container, vorbis the bitstream) and the engine does not support importing binaries such as these into any container of it's own.