This is both fascinating and infuriating.
So, as far as I can see there are three releases on Qobuz that contain the 1962 Campoli/RPO/Pritchard recording:
Beulah:
G.O.P. (never realised they had a music label!)
Sunday Club Records:
Counting soloist, orchestra and conductor the Beulah version contains six searchable performers in total: Alfredo Campoli, Royal Philharmonic Orchestra, John Pritchard, plus Nathan Milstein, Philharmonia Orchestra, Leon Barzin (for the coupled Mendelssohn and Bruch Concertos).
Searching directly in Qobuz:
- “Alfredo Campoli” returns the G.O.P. and Sunday Club Records releases but not the Beulah.
- “Royal Philharmonic Orchestra” returns (among everything from Tubular Bells to Sleep Baby Sleep) the Beulah, but neither the G.O.P. nor the Sunday Club.
- “John Pritchard” returns the G.O.P., the Sunday Club and the Beluah
Now there is no coupling on the Sunday club release and the G.O.P. couples the Beethoven Concerto with two Beethoven Romances played by Max Rostal (also accompanied by the RPO under Pritchard) so one would not expect “Milstein”, “Philharmonia” or “Barzin” to bring up either of these recordings. But they should all, in theory, find the Beulah.
- “Nathan Milstein” does not.
- “Philharmonia Orchestra” does.
- “Leon Barzin” does (despite him not being a recognised tag in Qobuz, The Kings of Leon is their best suggestion).
However searching Qobuz via Roon, none of these search terms return the Beulah. The rub here is that I need to play via Roon in order to use my new room correction filter, so the SQ benefits very significantly outweigh the costs.
I am going to open a ticket with Roon. Many thanks @Zyberguran & @PAR for your help with the detective work here!