The Missa brevis Sancti Joannis de Deo, also known as the Kleine Orgelmesse (Little Organ Mass) was composed in 1775, and is unique among Haydn's Mass settings, most of which are elaborate, extended works requiring full orchestral resources, large choirs and operatically trained soloists. By contrast, the Missa brevis Sancti Joannis de Deo is a concise and restrained work, commissioned by the Brothers Hospitallers of St. John of God (thus its name, Joannis de Deo), a religious order of lay-brothers committed to the care of the sick and dying, for use in their hospital chapel. The Brothers specified that the Mass was to be of modest length, and allowed for only one extended solo, at the Benedictus, for soprano and concertante organ. Haydn carefully followed these instructions, and in the result created a work of great charm that has endured in liturgical use much longer than his larger-scale Masses. The Kyrie opens quietly and continues with a graceful sweep that never loses touch with its text, "Lord, have mercy." The Sanctus/Benedictus is the most extended section of the work, with much interplay between the vocal soloist and the concertante organ at the Benedictus. The Agnus Dei returns to the straightforward, meditative style of the Kyrie, and the work closes as softly as it opened.
Haydn's oratorio The Creation was composed late in his career, after he had left the employ of the court of Esterhaza. It was first performed in Vienna in 1798, with resounding success. The text is based on the book of Genesis and Milton's Paradise Lost. The musical structure follows that established by the oratorios of Handel, whose influence is readily apparent in the superb chorus The Heavens are Telling. The Creation is poised between the 18th and 19th centuries: God is portrayed at once as a kind of master architect, showing the 18th-century influence of freemasonry; and the work also conveys a mood of awe before nature, portending the romanticism which pervaded the art and literature of the early 19th century.