Try http://freemusicarchive.org, they have tons of music for all your needs.

The only free content from Adobe Stock is in the photography category. There are other sources of free audio files that you can use for elearning. Just remember to check the license. For example, you might have to right to download music files and listen to them personally but may not have the right to use them in works that you earn from.

I subscribe to Storyblocks.com for all my multimedia needs. For one monthly fee, I have access to all their images, video and music files for use in my creative works.

You will have to look elsewhere for free audio… sorry.