Found this site:
Do you have any relationsship between AcouticBrainz and Tunebat?
I can’t link directly to a search result, but if you search for “U2” and click on the cover from one of the search results, you can see something like this.
I don’t advertise for this site, it just looked very similar to AcousticBrainz on the first sight.
Comparing with AcousticBrainz, it seems like a bunch of the parameters have different values, and it also seems like they’re calculating different parameters (“speechiness”) than what AB currently does:
https://acousticbrainz.org/4786e4f5-1d54-45a2-bcf6-28f03b029e61
It says at the bottom that it’s powered by the Spotify Web API, so I’m guessing those values are from there too.
We don’t compute “liveness” or “speechiness” in AcousticBrainz, so I think that @freso is right about the data coming from Spotify. Having said that, the website looks really nice - it would be great to try and make acousticbrainz.org look this nice!
