There's a great recording of the Waisenhausmesse (allegedly written when
Mozart was 12) on LaserLight along with some shorter and unstoppably
joyous liturgical works.  Although I'm not much of a fan of his Great
C Major Mass, just about any of the other ones is worth a gander--the
Kroenungsmesse (Coronation Mass) is a good one to start with if you don't
already no it.

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