Paraphrase mass

A paraphrase mass is a musical setting of the Ordinary of the Mass that uses as its basis an elaborated version of a cantus firmus, typically chosen from plainsong or some other sacred source. It was a common means of mass composition from the late 15th century until the end of the 16th century, during the Renaissance period in music history, and was most frequently used by composers in the parts of western Europe which remained under the direct control of the Roman Catholic Church. It is distinguished from the other types of mass composition, including cantus-firmus, parody, canon, soggetto cavato, free composition, and mixtures of these techniques.