I have try many sites with .mp3 but it just stay quit… cou any one send a working .mp3 url?
just open up any game with background music, like this one:
and look at its sound behavior.
If you want to find some music, take a look here: http://blog.flowlab.io/2013/10/finding-great-free-music-for-your-games.html
I use a site called kiwi6.com for my mp3s I make