Incompetech is one of my go-to places for great royalty free music. This site catalogues the musical compositions of Kevin MacLeod. You’ll find an extensive collection of free-to-use music spread across various categories – from hard rock to electronic with a few different license types offered, depending on the cost of the track. Standard tracks cost and may be purchased via PayPal, while the Creative Commons tracks are free to use, as long as you cite the composer and his website. Unported license, meaning you are free to share, remix and use commercially, as long as you credit the site. If you’d rather not credit the site, Incompetech allows you to pay a nominal fee to do so.