Overview
Introduction
Apart from the 1733 Mass for the Dresden court (later incorporated in the Mass in B minor), Johann Sebastian Bach wrote four further Kyrie–Gloria Masses, BWV 233–236. These compositions, consisting of the first two sections of the Mass ordinary (i.e. the Kyrie and the Gloria), have been indicated as Missae breves (Latin for "short masses") or Lutheran Masses. They seem to have been intended for liturgical use, considering a performance time of about 20 minutes each, the average duration of a Bach cantata. They may have been composed around 1738/39. Possibly they were written for Count Franz Anton von Sporck or performed by him in Lysá.
Each of the Kyrie-Gloria Masses is in six movements: the Kyrie is one choral movement (with Kyrie/Christe/Kyrie subdivisions) and the Gloria is in five movements. The first and last movement of the Gloria are also choral, framing three arias for different voice types. The music consists mostly of parodies of earlier cantata movements. Bach changed the music slightly to adjust to the Latin words, but kept the original instrumentation. For instance, the opening chorus of Es wartet alles auf dich, BWV 187, became the final movement of the Missa in G minor, Cum sancto spiritu. Occasionally he switched a voice part, for example he asked for a tenor in the Quoniam of that Missa, a parody of the soprano aria Halt ich nur fest an ihm of that cantata.
