<P> The Kyrie, Gloria, Credo, Sanctus, Benedictus and Agnus Dei use the same text in every service of the Mass . Because they follow the regular invariable "order" of the Mass, these chants are called "Ordinary". </P> <P> The Kyrie consists of a threefold repetition of "Kyrie eleison" ("Lord, have mercy"), a threefold repetition of "Christe eleison" ("Christ have mercy"), followed by another threefold repetition of "Kyrie eleison ." In older chants, "Kyrie eleison imas" ("Lord, have mercy on us") can be found . The Kyrie is distinguished by its use of the Greek language instead of Latin . Because of the textual repetition, various musical repeat structures occur in these chants . The following, Kyrie ad . lib . VI as transmitted in a Cambrai manuscript, uses the form ABA CDC EFE', with shifts in tessitura between sections . The E' section, on the final "Kyrie eleison", itself has an aa'b structure, contributing to the sense of climax . </P> <Table> <Tr> <Td> </Td> <Td> Kyrie 55, Vatican ad lib . VI, from Cambrai, Bibl . Mun. 61, fo. 155v, as transcribed by David Hiley Example of musical repeat structures in Gregorian chant </Td> </Tr> <Tr> <Td_colspan="2"> Problems playing this file? See media help . </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> Kyrie 55, Vatican ad lib . VI, from Cambrai, Bibl . Mun. 61, fo. 155v, as transcribed by David Hiley Example of musical repeat structures in Gregorian chant </Td> </Tr>

Chant is a type of music that is