What I would do is export the movie first [the maya movie], and add the sound in an oter applikcation, such as iMovie, Windows movie maker, etc. Theres always a way to get music free into your movie. And if the application dosen't allow multiple sounds playing at once, then cut up the songs in an application such as MP3 Trimmer [allows effects such as fade-in/out] and then add the induviduall sound files into windows movie maker/iMovie/Premier/whatever video editing application you have.