Critical melody by me, following source with diastematic indications from F-SO334, F-Pn LAT 12044, and LAT 1090. Rsigns are original but formulaic. Second part (Venite...) is from LR1895, and formulaic.

For musical reasons and straying from the critical melody, ended "beatus" with fa-mi instead of sol-la

Oriscus in first group: see 0815I and H1I

Added NABC, beginning based on H1I