Well, like in open source software we have licenses like MIT and WTFPL, in creative industries there's different Creative Commons licenses like CC0 or CC-BY-SA for example which would grant different usage rights in certain circumstances.
There's a lot of different mediums which supports sharing and searching for media under different CC licenses, I've tagged a majority of my SoundCloud releases for example with great success.
If we're talking about a whole site dedicated for openly licensed music and audio, freesounds.org comes to mind.
The issue with the permissive licensing is when the works get legally used in works that aren’t licensed that way. This is a common cause of YouTube contentID legal “false positive” results.
Both you and the other person have the rights to that audio and platforms like YouTube have put no effort into giving us a solution to resolve this “edge case”.
There's a lot of different mediums which supports sharing and searching for media under different CC licenses, I've tagged a majority of my SoundCloud releases for example with great success.
If we're talking about a whole site dedicated for openly licensed music and audio, freesounds.org comes to mind.