History - De profundis (verses, rhythmic signs)
Aug 16, 2021 (Jacques Perriere)
adding Graduale Romanum 388 and Liber Usualis 1076 for the rhythmic signs
remarks
Sources:
http://www.gregorianbooks.com/img/book/00/of.de_profundis.png
http://www.gregorianbooks.com/img/book/00/of.de_profundis.pdf
sources
[{"chant_id":"15784","source":"2","page":"388","sequence":"2","extent":"2"},{"chant_id":"15784","source":"3","page":"1076","sequence":"2","extent":"2"},{"chant_id":"15784","source":"32","page":"126","sequence":"01","extent":"12"}]