There are a bunch of (disc) ID's that some people tag into their flac files:
ACCURATERIPID
ACCURATERIPDISCID
MUSICBRAINZ_ARTISTID
MUSICBRAINZ_ALBUMID
MUSICBRAINZ_TRACKID
ACOUSTID_ID
Just to mention a few.
Do you guys tag the ID's above, or other disc/track ID's? What is the purpose?
Do online services respond better with these ID's?
Or are they tagged just in case you will ever need them in the future?