Hymnography and the Great Canon
Andrew is credited with introducing the canon as a developed form of liturgical poetry. His most celebrated work is the Great Canon, also called the Canon of Repentance, an extended penitential hymn of nine odes containing roughly 250 troparia or strophes.
The Great Canon proceeds chronologically through the whole of the Old and New Testaments, drawing on the examples of biblical figures and correlating each to the soul's need for repentance. It is chanted during Great Lent: read in portions during the first week of the Fast and again in its entirety on the Thursday of the fifth week.
Beyond the Great Canon, Andrew composed a large body of liturgical poetry. He is credited with approximately twenty-four canons and more than one hundred irmoi, as well as hymns for feasts including the Nativity, Palm Sunday, Holy Week, and the Meeting of the Lord (Candlemas).