KNOW MORE ABOUT FREE MUSIC

1. Can you sell public domain music?
   For example, music in the public domain is music that either has an expired copyright (or never had a copyright) or which all the rights to that music have expired over time. ... This means you can print, copy, and sell copies of Beethoven's musicwithout paying a royalty to anyone.Mar 28, 2011
2. https://www.safemusiclist.com/how-to-legally-use-music-commercial-video/
3. https://freepd.com/
4. www.yolinux.com/TUTORIALS/PublicDomainMusic.html
5. https://www.wordstream.com/blog/ws/2018/06/14/royalty-free-background-music