That appears to be one person publishing their music under CC-BY. That's nice of them, but not similar to Freesound's massive collection.
I think http://www.ccmixter.org/ would be a more likely candidate, or SoundCloud's search restricted to CC licenses. There are also lots of musicians publishing CC music on Bandcamp, but the site doesn't allow filtering by license. The best approximation I've found is searching "some rights reserved" site:bandcamp.com with DDG and then checking which license the link points to.
https://www.jamendo.com/
https://cchound.com/
http://ccmixter.org/
And probably many more