In the process of writing a tutorial on adding music to Aurora skins step by step.
Regarding your earlier post about the possible size & length limitations, I don't think there is any, but I haven't added a track longer than 10 minutes to confirm.
I got my music to play on another skin that didn't originally have it. Do you remember the steps you did in making your track? Please post them if you can & I'll see if I can figure it out the issue.
Did you export the track in Signed 16-bit PCM WAV format?
Edit
Tutorial's been finished! Check it out here