Apostolus Petrus respondit

Source: 
Worcester, Cathedral - Music Library, F.160 (olim 1247) (with hymnal)
Folio: 
228v
Sequence: 
4
Feast: 
Petri, Pauli
Office/Mass: 
M
Genre: 
A
Position: 
2.6
Cantus ID: 
200342
Mode: 
4
Differentia: 
1
Differentia database: 
1--h-g-h-jh-gfe-e--4 19b
Addendum: 
P: 327