Johann Michael Haydn was an Austrian composer born on September 14, 1737, in Rohrau, Austria. He was the younger brother of the more famous composer Joseph Haydn. Johann Michael is best known for his choral and orchestral works, including symphonies, masses, and chamber music, which reflect the classical style of his time. Throughout his career, Haydn served as a court musician and conductor in various locations, including Salzburg. His music was influential in the development of the classical genre, and he composed over 400 works. Johann Michael Haydn passed away on August 10, 1806, leaving a significant legacy in the world of classical music.