Getting music data

I think it would be better getting data about music items from online databases as Allmusic or CDDB instead of stores as Amazon (more titles, expecially from outside U.S./UK, and less confusion).
Would it be possible?

The companies charge for usage of the data, amazon provides a free api to use their data.

How about these?
www.freedb.org/
www.freedb2.org/
musicbrainz.org/
They are all free!

I am considering using musicbrainz although not all their services are free. It may be a big job to convert though. How good is freedb?

As far a having loads of data (which mostly seems to be correct) freedb seems good. I've not tried writing anything to query freedb - though I did have a play with musicbrainz. I think musicbrainz have a 1 query a second limit on their free service.

You could get a database dump and their server software from freedb too and import it onto your server :)

FreeDB's data (with my collection anyway) just isn't up to the quality of MusicBrainz and aims to store less information about artists and releases, although MusicBrainz is arguably less complete for some artists and gets its information about new releases later.

Problem really with FreeDB is a) the revision system not being used by people properly and b) the fact that a revision filled with nonsense can overwrite a decent existing record. That said, it helps millions when ripping albums :o)