History - Certum tenentes ordinem
Dec 17, 2013 (Olivier Berten)
Moved source to the source fields (after adding LH to the list)
remarks
This is the source
1983 - Liber Hymanrius (Solesmes)
page 12
sources
[{"chant_id":"4238","source":"15","page":"12","sequence":"0","extent":"0"}]