If you're going to look for Gerhard Schmidt-Gaden under a different name
try "Gerhard Schmidt" (or some spelling thereof) rather than "Gaden." As my
copy is in storage somewhere I don't have access to all the details, but
you may try searching on the soloists Hans Bucchierl (boy soprano), Werner
Krenn (tenor), and/or Barry McDaniel (bass).  Also, the notes on my copy
(BASF LP issue) are explicit about their using a completion by someone
other than Sussmayr.

Aaron J. Rabushka
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http://www.cowtown.net/users/arabushk/