It most certainly is possible!
To change the music, or even your game's interface, sky, or textures, you can find a mod of your liking and download it into your game, or even create your own!
I suggest checkin' out the Feral Heart Addons and Mods board. There's a bunch of fun things created by talented floofs that you can look through to download and add into your game- including different music!
Here is the link to the board, check it out!: Addons & Mods (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&board=34.0)