Aperiet os suum in oratione

Source: 
Worcester, Cathedral - Music Library, F.160 (olim 1247) (with hymnal)
Folio: 
278r
Sequence: 
9
Feast: 
Comm. unius Confessoris et Episcopi
Office/Mass: 
M
Genre: 
V
Position: 
01
Cantus ID: 
006592a
Mode: 
7
Addendum: 
P: 426