Johann Michael Haydn (1737-1806), was one of the most accomplished composers of church music in the later 18th century. He was the younger brother of Josef Haydn. Like his brother, ‘Michael’ Haydn became a choirboy at St. Stephen’s Cathedral in Vienna, receiving his early musical instruction there. In 1762 he became concertmaster to the archbishop of Salzburg and remained there for the rest of his life succeeding Wolfgang Amadeus Mozart as cathedral organist in 1781.
During his lifetime Michael Haydn was considered a better composer of church music than his brother. Haydn also wrote numerous symphonies, divertimenti, concerti and other secular compositions. He was an intimate friend of Mozart who wrote his 2 violin/viola duos to fulfil a commission of 6, which Haydn was too ill (or too drunk!) to complete. He was a teacher of Carl Maria von Weber.