History - In principio et ante
Nov 25, 2022 (xmarteo)
Removed reference to Antiphonale Monasticum, this A/ is not in this book but in AR2 as otherwise noted
sources
[{"chant_id":"10049","source":"6","page":"54","sequence":"2","extent":"2"},{"chant_id":"10049","source":"17","page":"54","sequence":"2","extent":"2"}]