Pope St. Gregory the Great

https://faith.nd.edu/s/1210/faith/interior.aspx?sid=1210&gid=609&pgid=16180&cid=32537&ecid=32537
He collected melodies of plain chant used in the liturgy—today that style is known as Gregorian chant, after him
Gregory is one of the four great doctors of the Church, along with St. Ambrose, St. Augustine, and St. Jerome. These four and 32 other doctors have been singled out for their ability to articulate and teach the faith.

Franciscans of Saint Bonaventure Province

Home

Mary, Mother of God Parish

https://www.motherofgodchicago.org/