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The term "Sanctus" refers to an ancient Christian hymn of adoration, sung or said just before the prayer of consecration in traditional liturgies. Its opening words, "Holy, holy, holy," are derived from Isaiah 6:3. In the context of music, the Sanctus is part of the Ordinary of the Mass, a set of texts that remain constant in every mass. It is often sung by the choir and can sometimes be divided into the Sanctus and Benedictus sections.12

Gregorian chant is a type of monodic and rhythmically free liturgical chant used in the Roman Catholic Church. The Sanctus, as part of the Mass, has been set to music in various forms throughout history, from early plainchant melodies to complex polyphonic compositions. A "Sanctus bell" is a bell rung by a server at specific points during the mass, including at the Sanctus.324

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