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?