This won’t really answer your question, but it may alert the Maag-
ophiles around here to corners of the Maag discography of which they
may be unaware: recordings of six live opera broadcasts. Maag
regularly conducted at the Met in the 1970’s including four Saturday
afternoon broadcasts. Since all Met broadcasts get recorded by
somebody, I’m sure all of these are making the rounds. Since all but
the first one were rebroadcast on Sirius, there’s an even greater
certainty that they’re making the rounds. (The only one I have is the
Don Giovanni broadcast, Siepi’s last: it’s pretty good, but I’ve heard
bejillion performances of Don Giovanni and don’t have a strong
specific recollection of this one.)
Mozart: Die Zauberflöte
Adriana Maliponte, Edda Moser, Stuart Burrows, John Reardon, Hans
Sotin
12/23/1972
Mozart: Don Giovanni
Edda Moser, Pilar Lorengar, Rosalind Elias, George Shirley, Cesare
Siepi, Ezio Flagello
3/3/1973
Mozart: Die Zauberflöte
Anna Moffo, Rita Shane, Luigi Alva, Donald Gramm, Jerome Hines
12/15/1973
Bellini: Norma
Shirley Verrett, Elena Obraztsova, Carlo Cossutta, Paul Plishka
3/17/1979
There are also at least two live recordings of Così with Maag, one a
1968 broadcast from Geneva with a Swiss soprano and a Swiss tenor, the
other an RAI broadcast that’s been released on CD by Arts Music. I've
included a link for the listing at Amazon:
Mozart: Così fan tutte
Lisa della Casa, Biancamaria Casoni, Graziella Sciutti, Eric Tappy,
Claudio Giombi, Paolo Montarsolo
Orchestre de la Suisse Romande
1968
Mozart: Così fan tutte
Teresa Stich-Randall, Janis Martin, Adriana Martino Werner Krenn,
Victor Braun, Carlos Feller
Orchestra e coro di Roma della RAI
9 November 1967
Amazon listing:
http://tinyurl.com/7l8a2mz
-dg