The Missa Brevis No. 6 in G major

G major

G major is a major scale based on G, with the pitches G, A, B, C, D, E, and F. Its key signature has one sharp, F; in treble-clef key signatures, the sharp-symbol for F is usually placed on the first line from the top, though in some Baroque music it is placed on the first space from the bottom...

, K. 140, K3 Anh. 235d, K6 Anh. C 1.12, may have been written by Wolfgang Amadeus Mozart

Wolfgang Amadeus Mozart

Wolfgang Amadeus Mozart , baptismal name Johannes Chrysostomus Wolfgangus Theophilus Mozart , was a prolific and influential composer of the Classical era. He composed over 600 works, many acknowledged as pinnacles of symphonic, concertante, chamber, piano, operatic, and choral music...

 in 1773 for Salzburg

Salzburg

-Population development:In 1935, the population significantly increased when Salzburg absorbed adjacent municipalities. After World War II, numerous refugees found a new home in the city. New residential space was created for American soldiers of the postwar Occupation, and could be used for...

. The mass is scored for soloists, choir, strings and organ, the latter supplying figured bass

Figured bass

Figured bass, or thoroughbass, is a kind of integer musical notation used to indicate intervals, chords, and non-chord tones, in relation to a bass note...

 for most of the duration. The earliest surviving score and parts were prepared by a copyist

Copyist

A copyist is a person who makes written copies. In ancient times, a scrivener was also called a calligraphus . The term's modern use is almost entirely confined to music copyists, who are employed by the music industry to produce neat copies from a composer or arranger's manuscript.-Music...

, "with completions and corrections in Mozart's hand." These were found in a cloister in Augsburg

Augsburg

Augsburg is a city in the south-west of Bavaria, Germany. It is a university town and home of the Regierungsbezirk Schwaben and the Bezirk Schwaben. Augsburg is an urban district and home to the institutions of the Landkreis Augsburg. It is, as of 2008, the third-largest city in Bavaria with a...

, Germany

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

.

The setting is divided into six movements.

1. "Kyrie" Andantino, G major, 3/4
2. "Gloria" Allegro, G major, 6/8

   —"Laudamus te..." Andantino, 3/8

3. "Credo" Allegro, G major, common time
   Common Time
   "Common Time" is a science fiction short story written by James Blish. It first appeared in the August 1953 issue of Science Fiction Quarterly and has been reprinted several times: in the 1959 short-story collection Galactic Cluster; in The Testament of Andros ; in The Penguin Science Fiction...
   
   

   —"Et incarnatus est..." Andantino, E-flat major, 3/4

   —"Et resurrexit..." Allegro, G major, common time

4. "Sanctus" Andante, G major, 3/4

   —"Pleni sunt caeli..." Allegro vivace, 2/4

5. "Benedictus" Andante, C major
   C major
   C major is a musical major scale based on C, with pitches C, D, E, F, G, A, and B. Its key signature has no flats/sharps.Its relative minor is A minor, and its parallel minor is C minor....
   
   , 2/4

   —"Osanna..." Allegro vivace, G major

1. "Agnus Dei" Andante, G major, common time

   —"Dona nobis pacem..." Allegro, G major, 3/8

Ludwig von Köchel, in the first edition of his catalog of Mozart's music, thought the Mass roughly contemporary with Lucio Silla

Lucio Silla

Lucio Silla, K. 135, is an Italian opera in three acts composed by Wolfgang Amadeus Mozart. The libretto was written by Giovanni de Gamerra.It was first performed on 26 December 1772 at the Regio Ducal Teatro in Milan....

and "Exsultate, jubilate

Exsultate, jubilate

Exsultate, jubilate K. 165, by Wolfgang Amadeus Mozart was written in 1773.This religious solo motet was composed at the time Mozart was visiting Milan....

." Alfred Einstein thought its original composition to be closer to that of the Serenade No. 6 in D major

Serenade No. 6 (Mozart)

The Serenade for Orchestra No. 6 in D major K. 239, Serenata notturna, was written by Wolfgang Amadeus Mozart in Salzburg, in 1776. Mozart's father, Leopold Mozart, wrote the title and a January 1776 date on the original manuscript.It has three movements:...

with his revision of Köchel's catalog in 1937, while Franz Giegling et al thought it not be by Mozart at all. However, they failed to suggest a probable composer.