Guilde Internationale du Disque is the local French subsidiary of the Musical Masterpiece Society label, founded in 1953, operated mainly by correspondence, with the first subscription series in 1954, but also through a ~25 retail outlets in the country, with the last one closing in the early 80s.
Merged in 1986 with Edition Atlas.

* The MMS cat# come from the American origins of the guild: the Musical Masterpiece Society, itself originated from Concert Hall.

* the SMS cat# refer to the stereo recordings.

Vinyl:
One or two letters may appear on labels, identifying the pressing plant.
TU = Turicaphon AG
P = Philips Phonografische Industrie or Phonodisc B.V.
F = Pathé Marconi, Chatou (until 1971) and Pathé Marconi EMI, Chatou from 1972 onwards