Explaining The Bible on Instagram: "Kyrie II in Gregorian chant refers to the setting numbered II in the Kyriale (the collection of chants for the Ordinary of the Mass), also known as “Kyrie fons bonitatis” or sometimes associated with “Summe Deus” in ad libitum collections. This ancient melody, in mode II (Hypodorian, a plagal mode with final on RE and range emphasizing both below and above the reciting tone), features flowing, melismatic lines—several notes sung to a single syllable—giving it