Welcome to MusicBrainz! - MusicBrainz.org:
MusicBrainz is a community music metadatabase that attempts to create a comprehensive music information site. You can use the MusicBrainz data either by browsing this web site, or you can access the data from a client program — for example, a CD player program can use MusicBrainz to identify CDs and provide information about the CD, about the artist or about related information. You can also use the MusicBrainz Tagger to automatically identify and clean up the metadata tags in your MP3 collections.
I have been playing with iEatBrainz which works pretty well. MusicBrainz.org has links to software for Mac, Win, & Linux.
Did MusicBrainz get over the problem they had where thier DB would reach capacity so they’d nuke the oldest or least used entries? It made trying to find maches very hard so I stopped using it.
Maybe I’ll have to check it out again.
Not sure. That was a while back if i remeber. One would think such a problem would be fixed by now. I shall look into it.