Is it possible to change toribash's musics?

Yes, it is. The music is stored inside the Toribash folder, I'm at college at the moment so I can't find the direct path, it's in the data folder though I'm sure.

You need to name it Track1.ogg

You can convert it to a .ogg using Audcity, which is a free piece of audio software.

Edit: Download link.

thanks Fee