Public Domain and Royalty Free Music

If you are looking for inexpensive music and sound effects, you are sure to find stuff you can use on one of these sites.  It will take some looking, but it's completely free!

https://www.freesoundtrackmusic.com/

 ALL of the music in this online library can be licensed for royalty free use in films, videos, video games, YouTube videos or other digital multimedia productions. 

https://musopen.org/music/ allows you to browse royalty free music by composer, performer, instrument, tag, form, or time period.

https://freepd.com/  First three MP3 files are free, and you are free to use them however you wish.

IMSLP Petrucci Music Library

Free Music Archive  

Moby has made hundreds of tracks available for all kinds of projects.
https://mobygratis.com/

Good Hunting!