All of my music is free (unless you want to donate) and licensed under Creative Commons Attribution-ShareAlike. Which means you can do whatever you want with it. Even commercial use is fine as long as you attribute the music to me somehow. Also, if you make a derivative of my music (remix, etc.) you must also license it similarly.
To download it for free just enter the number zero in the 'name your price' box.
If anything is unclear or you would like to contact me for any reason my email is: firstname.lastname@example.org