I make use of the folowing ID3V2 tags:
ALBUM TALB Standard
ALBUMARTIST TPE2 Standard
ARTIST TPE1 Standard
COMMENT COMM Standard
COMPILATION TCMP 0/1
COMPOSER TCOM I used this manly as AUTHOR for audiobooks/audioplays
CONDUCTOR TPE3
CONTENTGROUP TIT1 "Audiobook", "Audioplay", "Music", …
COPYRIGHT TCOP
DISCNUMBER TPOS Standard; should be used as string to keep values like "02/04"
GENRE TCON Standard
INVOLVEDPEOPLE TIPL
LANGUAGE TLAN important for filtering audiobooks/audioplays in different languages
LYRICIST TEXT
MEDIATYPE TMED "LP", "CD", "MC", "Web", …
ORIGALBUM TOAL for tracks on compilations
ORIGARTIST TOPE for remixes or remakes
ORIGYEAR TDOR interesting for remastered albums.
PODCAST PCST 0/1
PODCASTID TGID
PODCASTURL WFED
PUBLISHER TPUB interesting for same audiobook/audioplay storys from different publishers => different interpretation of story
RATING WINAMP
RELEASETIME TDRL I use this field for date of live recordings and date of podcast release
SETSUBTITLE TSST "Remastered", "Special Edition", …
SUBTITLE TIT3 "Edit", "Remix", "Live", "Demo", …
TITLE TIT2 Standard
TRACK TRCK Standard; should be used as string to keep values like "03/12"
UNSYNCEDLYRICS USLT
WWWRADIOPAGE WORS
YEAR TDRC Standard
ALBUMARTISTSORT TSO2 should be used (optional) for sorting tracks in Library and Playlist
ALBUMSORT TSOA should be used (optional) for sorting tracks in Library and Playlist
ARTISTSORT TSOP should be used (optional) for sorting tracks in Library and Playlist
TITLESORT TSOT should be used (optional) for sorting tracks in Library and Playlist
HasAlbumArt could be useful for filtering files with missing albumart
Path could be useful for filtering by path
I use Mp3Tag for tagging all my files. Would be nice if WACUP would support some more of these fields. Therefore I gave some hints why these fields are important (to me).
Rio