Yes, you are probably right. Also, I found this list of Gould recordings with partial attribution to recording studio: http://en.wikipedia.org/wiki/Glenn_Gould_discography which seems to indicate there were many recording sessions, although I wonder if they did multiple albums in a session ever? What we need are some volunteers to put together a chronological list of who recorded when. IMHO. Combining the Gould list with this other one http://en.wikipedia.org/wiki/Category:Albums_recorded_at_CBS_30th_Street_Studio This list is vague, unfortunately ("CBS Recording Studio NYC" apparently means "30th St. Studio" as opposed to 799 or 52nd St.), but it must be possible to look up these specific albums. At least that list is a start and full of leads.