The Missa in honorem Beatissimae Virginis Mariae (Hob.
XXII:4) in E♭ major was written by Joseph Haydn for performance in Esterhaza in 1770.
It was part of Haydn's duties to compose musical masses.
It is known as the Gross Orgelsolo Mass in German speaking lands.
In this work, the organ not only has an attractively figured obligatory part in Benedictus (as in other organ solo fairs of the era), but at least in sections in all other movements with the exception of the Sanctus.