Mp3tag has been great for getting tags from Discogs (or musicbrainz and freedb) into the mp3s of my vinyl collection for display in Windows Media Player. However, the Composer column in mp3tag remains blank, even though composers are shown against the tracks on the web page for the relevant Discogs ID. (Discogs says "written by").
I'm not really up to clever scripting stuff, but I don't understand why Composer doesn't come along with Track/Title/Artist info.