: This is a widely used choral setting. You can find the full partition, including the Sanctus, on Scribd - Missa Laetare Scheel
: Public domain scores are typically hosted on the IMSLP Petrucci Music Library . sanctus missa laetare partition pdf
: Look at existing scores of similar pieces to understand structure, harmony, and melody. : This is a widely used choral setting
The pronunciation should be uniform. Pay attention to the "Sanctus" vowels. In the "Pleni sunt caeli," ensure the sixteenth notes are clean and not rushed. including the Sanctus