beets is one of a number of application that use the Acoustid database to fingerprinting and identify songs, but there are many other including MusicBrainz Picard and SongKong
I (the author of SongKong) have been looking at the Acoustid database and have generated some reports that show acoustid → musicbrainz Id pairs that are very very likely to be wrong, but these cannot be removed automatically they need to be checked and removed manually, and there are many.
In the spirit of cooperation I would be grateful for any help in removing and checking these, if you have just 30 minutes to spare to fix a few artists that would be fantastic and could make a big dent in this. This is fixing the live Acoustid database so will benefit all applications that use Acoustid
There are a number of reports at http://www.albunack.net/reports.jsp