Gregofacsimil + neumes from H + rsigns according to H. Modern verse present only in Bu118-122 which is not online. Contrafacted the irregular and beautiful verse from H. Gloria Patri from Gregofacsimil. Optional Alleluia from P7F4R2 Cantus 007028, from H (authentic neumes).

Selected after positive feedback from dcrochu

Added bemol for disambiguation after bar