Tu es Petrus et super

Source: 
Worcester, Cathedral - Music Library, F.160 (olim 1247) (with hymnal)
Folio: 
205r
Sequence: 
1
Feast: 
Cathedra Petri
Office/Mass: 
M
Genre: 
R
Position: 
1.3
Cantus ID: 
007788
Mode: 
7
Addendum: 
P: 278