Great Mass in C minor (German: Große Messe in c-Moll), K. 427/417a, is the common name of the last musical setting of the mass by Wolfgang Amadeus Mozart (not counting his Requiem Mass left unfinished at his death). He composed it in Vienna in 1782 and 1783, when he was no longer a church musician of the Salzburg Cathedral. The large-scale work, a missa solemnis, is scored for two soprano soloists, a tenor and a bass, double chorus and large orchestra. It remained unfinished, missing large portions of the Credo and the complete Agnus Dei.

Date of composition 1783 (1782–1783)
Premiered 1783, October 26th in Salzburg, Austria
Type Mass
Tonality C Minor
Catalogue KV 427
Instruments Chorus/Choir
Orchestra
Voice - Solo voices ;
In listings Famous Works
Autotranslations beta Wolfgang Amadeus Mozart: Great Mass en do mineur, KV 427
Wolfgang Amadeus Mozart: Great Mass in do minore, KV 427
Wolfgang Amadeus Mozart: Great Mass c-moll, KV 427