Arrangement for: Piano

Adagio and Allegro in F minor for a mechanical organ, K. 594, is a composition by Wolfgang Amadeus Mozart, completed in late 1790.

The piece was commissioned by Count Joseph Deym von Stritetz [de] for use as a funeral mass to be played on a mechanical organ clock in the mausoleum for the recently deceased Generalfeldmarschall (Fieldmarshall) Ernst Gideon von Laudon, part of the Müllersche Kunstgalerie, the wax art gallery and organ museum of "Joseph Müller" (which was the Count Deym's assumed name). This displayed a casket covered with glass, through which one could view a wax figure of the Field Marshall. When the clock struck the hour, a lament was heard: a new one each week, one of which was Mozart's Adagio and Allegro.

Although Mozart intended the piece to be played on a mechanical clockwork organ, he wished later that it could be played on a conventional organ. In a letter to his wife Constanze dated "3rd October, 1790", he wrote, "If it were on a large clock-work with a sound like an organ, I'd be glad to do it; but as it is a thing made up of tiny pipes only, which sound too shrill and childish for me". As time passed, Mozart seemed to be content with the decision, saying later that the work and its installation in the gallery in "fruitlessness and purity and compatibility to the works of art eclipses anything that anyone has ever succeeded in producing". The piece takes about twelve minutes to perform.

The piece has three movements.

In 1791 Mozart wrote another piece in F minor for mechanical organ, "Ein Orgel Stück für eine Uhr" (an organ piece for a clock), K.608. This composition is believed to have also been commissioned by Count Deym.