When I making video clip I always visit few website to find out fit music with my video these are royalty free website for personal use or perfectly free but before download you need to check very carefully mostly free for use.
this website is my favorite music website well organized by category, easy to download mp3 file and it serviced preview on the bottom of browser and music lists directly.
second. Audio library by youtube
the most advantage is multiple language service, most of the people can read options by their own languages and easy to download.