History - Tu es Petrus (Antiphona)
Apr 06, 2022 (Jacques Perriere)
removing Liber Antiphonarius (missing episema on 'hanc')
sources
[{"chant_id":"1950","source":"3","page":"1515","sequence":"5","extent":"2"},{"chant_id":"1950","source":"3","page":"1578","sequence":"1","extent":"1"},{"chant_id":"1950","source":"10","page":"230*","sequence":"1","extent":"1"},{"chant_id":"1950","source":"48","page":"752","sequence":"1","extent":"1"},{"chant_id":"1950","source":"48","page":"800","sequence":"2","extent":"1"}]