Jeff Ziegler‘s links for the memorial of St. Gregory the Great…

— Today is the memorial of St. Gregory the Great (d. 604), pope, doctor of the Church (traditionally reckoned among the four greatest Fathers of the Church in the West), patron saint of music.
— St. Gregory’s Moralia in Job (selections, Library of the Fathers translation).
— Moralia in Job (selections, O’Donnell translation).
— For the historical significance of St. Gregory’s “Moralia in Job,” see Jean Leclerq’s fascinating The Love of Learning and The Desire for God: A Study of Monastic Culture
— St. Gregory the Great’s Dialogues.
— St. Gregory the Great’s Pastoral Rule and Letters.
— Pope St. Pius X, Encyclical on St. Gregory the Great (Iucunda Sane, 1904).
— Pope John Paul II, Chirograph on sacred music (2003).
— Church documents on liturgical music (1903-74).
— The Church Music Association of America.
— Frequently asked questions on sacred music (CMAA).
— Today’s readings at Mass: 1 Thes. 4:13-18; Ps. 96:1, 3-5, 11-13; Lk. 4:16-30.
— Where the memorial is kept with special devotion, 2 Cor. 4:1-2, 5-7 and Lk. 22:24-30 may instead be read.
— Carlo Saraceni, “St. Gregory the Great” (1610).