In music, a setting of the music for the main service of the Roman Catholic Church. The items of the Mass are sung in Latin and fall into two groups: the
Ordinary (the items of the Mass are invariable, regardless of day or season) consists of the
Kyrie,
Gloria,
Credo,
Sanctus with
Benedictus, and
Agnus Dei; the
Proper (the items of the Mass are proper to the day or season) consists of additional matter namely the Introit, Gradual, Alleluia or Tract, Offertory, and Communion). A notable example of the Ordinary of the Mass is J S Bach's
Mass in B Minor (about 1748).
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