Aperiens Petrus os suum dixit

Source: 
Kraków, Klastor OO. Karmelitów na Piasku (Carmelite Convent), Ms.5 (rkp. Perg. 13)
Folio: 
135v
Sequence: 
7
Feast: 
Cathedra Petri
Office/Mass: 
M
Genre: 
A
Position: 
3.2
Cantus ID: 
001445
Mode: 
8
Differentia: 
G01
Differentia database: 
1--k-k-j-k-h-g--4 118a
Addendum: 
215