Petrus autem servabatur in

Source: 
Aachen (Aix-la-Chapelle), Domarchiv, G 20
Folio: 
248r
Sequence: 
6
Feast: 
Cathedra Petri
Office/Mass: 
M
Genre: 
A
Position: 
3.1
Cantus ID: 
004286
Mode: 
1
Differentia: 
G3
Differentia database: 
1--h-h-g-h-h-g--4 52f
Extra: 
035r