Gregorian chant is a form of plainchant used in the Roman Catholic Church. It consists of unaccompanied vocal music sung in Latin, characterized by its free-flowing rhythm and modal melodies. The chants are typically performed in a monophonic texture, meaning there is a single melodic line without harmony. Originating in the early Middle Ages, Gregorian chant is named after Pope Gregory I, who is traditionally credited with organizing and standardizing the chant repertoire. These chants are often used in liturgical settings, enhancing the spiritual atmosphere of religious ceremonies and services.