ummm if you want it in a self-made level it has to be in .wav format, so all you do is put it in the project directory, go into jed, open up the level, click on the sector you want the music in, hit enter, double click music or sound, click project or sound, and click on your .wav file, and click ok or whatever, but before you do that, see where it says sound? well type 300 in the blank box, and save.
Peace is a lie
There is only passion
Through passion I gain strength
Through strength I gain power
Through power I gain victory
Through victory my chains are broken
The Force shall set me free