History - Alma Redemptoris Mater (festivus forma ordinaria)
Nov 11, 2019 (SirPL)
Added reference to Antiphonale Monasticum II 2006
sources
[{"chant_id":"4694","source":"17","page":"472","sequence":"1","extent":"0"},{"chant_id":"4694","source":"18","page":"10","sequence":"1","extent":"2"}]