I just tried MP3tag, I selected the parent Music folder and it picked up all the tracks. Then went to cover art and chose Musicbrainz (as I don't have a discogs account) and it started embedding every album with the picture of the album of the first album in the track list. I don't have time to do album by album, I just need a quick fix.Select all your tracks, then in the Tag Sources Tab along the top, there is an option for cover art.
Just choose the search source.
Personally, I embed manually album-by-album, then I know it's the correct artwork. Just use Google images and pick the one with a decent quality.
I did this for all my 5000+ albums (and checked all track spellings, release dates, etc..). It was very time consuming, taking quite a few months.
But, now it's done I know it's all correct.
Maybe I'm doing something wrong, but how do I tell it to select the relevant cover art for each album rather than just the first album in the list?
I've also got to work out how to remove the incorrect cover art, fortunately I realised what it was doing and stopped it after about 20 tracks.