Once you've clustered the files, you can either click "Lookup" or "Scan." The difference is that a lookup is done on an entire cluster at once, and uses whatever existing metadata is already in the files to query the database. It's quite fast.

Sometimes Picard's lookup doesn't work, and then you need to scan the files. Scanning is done on a file-by-file process, and uses each file's audio fingerprint. It takes much longer, but it works well.

If you already know what files you're trying to tag (as in the case of my Faith No More album), you can also just manually query the server. Just type "Faith no More" into Picard's search box, and you'll be taken to a page in your default browser listing all of their releases. It takes just a click to pull the info back into Picard.

Once you have the correct album information, it's just a matter of dragging the files onto the album. Picard usually matches each file with its metadata correctly, but you can make corrections if needed.

Picard uses the metadata to update each file's tags, but you can also have it rename the files and even place them in folders according to any naming scheme you see fit. All in all, MusicBrainz Picard is a very efficient, high-quality way to bring some order into your vast, sprawling music library.