Esto fidelis usque ad mortem

Source: 
Worcester, Cathedral - Music Library, F.160 (olim 1247) (with hymnal)
Folio: 
019v
Sequence: 
8
Feast: 
Joannis Evang.
Office/Mass: 
M
Genre: 
V
Position: 
01
Cantus ID: 
601136a
Mode: 
6
Addendum: 
P: 039