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Can't identify what this is. Please help.
By Googling BA 5340a, I've found Mozart's DIXIT ET MAGNIFICAT KV 193 (BA 5340A).
This youtube link confirms the piece is in latin language, religious choir in C major key.
The sheet starts around 8:50, when you can hear the transition between 3 times / 4 times signature, and the lyrics match too.
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