History - Laetare Jerusalem

Feb 28, 2022 (fkchaud)

Adding Graduale Romanum 1974 as a source

sources
[{"chant_id":"653","source":"2","page":"138","sequence":"2","extent":"2"},{"chant_id":"653","source":"3","page":"559","sequence":"3","extent":"2"},{"chant_id":"653","source":"4","page":"108","sequence":"3","extent":"2"}]