where can i get free music backing tracks?

Answer 1

If you want backing tracks for videos you are creating, there's no end of freely available music on the Internet. Just read the copyright notices carefully.

Answer 2

Many genuine amateur composers want their stuff listened to, and credited, by other amateur associated arts, eg video makers.
The keyword to begin a search, would be "royalty free music".
Youll troll up loads of sites selling shopping musac probably, but should find links to amateurs, hopefully, and maybe start up bands, looking for exposure