Below are a list of commonly used audio/music websites that can be used for free or near to free. Please follow the site rules on each site for attribution as each has its own guidelines for re-using content on their sites.
Audio Library
Creative Common licensed audio by genres and various artists. Creative Commons, must attribute artist.
https://www.audiolibrary.com.co/
Creative Commons music
Free Music Archive
Sound Dogs
A site filled with downloadable sound Effects. Not free but very inexpensive if you need a particular sound effect for your presentations, videos and class materials.
https://www.sounddogs.com/search?keywords=Soundelux
YouTube Audio Library
YouTube has a selection of free music that can be used. However, you will require to sign up for a YouTube account before accessing this library.
https://www.youtube.com/audiolibrary.com/audiolibrary