If you didn't understand the run-on sentence above, let me put it in an easier way to read.
Yes, it is possible to change the songs that play in toribash.
take the song you want to play and convert it into a .ogg file using Audacity or another audio-editing program. import that file into the "C:/Games/Toribash 3.8/data/music" folder and name it track1. take the original track1 file and move it somewhere other than the music folder.
open up toribash and you music should play.