Missa brevis St. Joannis de Deo, for soloists, chorus, organ, and orchestra in B flat major, Hob.XXII:7, "Little Organ Mass"

The Missa brevis Sancti Joannis de Deo, Hob. XXII:7, Novello 8, is a mass in B-flat major by Joseph Haydn. The missa brevis (short mass) was written around 1775 for the order of the Barmherzige Brüder (Brothers Hospitallers) in Eisenstadt, whose patron saint was John of God. Scored modestly for soprano, four-part mixed choir, two violins, organ and bass, it is known as the Kleine Orgelmesse (Little Organ Mass) due to an extended organ solo in the Benedictus movement which also includes the only featured solo voice - a soprano.