This article outlines a number of online repositories of free to use music, normally for inclusion in videos or other content.

Considerations
Please note that music provided on these sites tend to be a wide range of genres and qualities, however, you can normally find something that fits, particularly if you’re wanting to use a song (or songs) as backing tracks for video.
Free music resources to explore (for inclusion in videos)
- Incompetech
- CCMixter
- Jamendo (please be aware of more restrictive licensing)
- CCTrax
- Pixabay
- Musopen
- YouTube Audio Library