Can't identify what this is. Please help.
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The latin text is "Sicut erat in principio, et nunc et semper, et in saecula saeculorum. Amen" : English "as it was in the beginning, is now and ever shall be, world without end. Amen", the so-called "Gloria Patri" – Angst Jul 31 '17 at 19:49
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.