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There are several sites where album information and / or album art can be downloaded from. MP3 Diags currently has interfaces for Discogs and MusicBrainz. The screenshot above is for Discogs, but MusicBrainz is quite similar. Going to one of these sites it the preferred method for getting album info. If you don't find what you are looking for on one site, you should try the other; keep in mind that adjusting the query manually may give you better results. If you can't find your album on either site, you may want to search the internet for the track list; if you find it, chances are you can import your data by simply pasting the text from the clipboard (that is, provided that you defined appropriate patterns.)

Besides the different database, there are some other differences in dealing with Discogs and MusicBrainz:

Discogs	MusicBrainz
One edit box for both artist name and album name	Separate edit boxes for artist name and album name
Cannot give track count as search criteria (which is no big deal, because you can use the "Track count" filter, at the bottom of the screen)	Track count is among the search criteria
Has genre information
Has style information
Has composer information
Has extra album information
	Has link to the album's page on Amazon.com