Ista est*

Source: 
Worcester, Cathedral - Music Library, F.160 (olim 1247) (with hymnal)
Folio: 
234v
Sequence: 
27
Feast: 
Annae
Office/Mass: 
M
Genre: 
R
Position: 
2.2
Cantus ID: 
006994
Mode: 
*
Addendum: 
P: 339