(Franz) Joseph Haydn (/ˈdʒoʊzəf ˈhaɪdən/; German: [ˈjoːzɛf ˈhaɪdən] ; 31 March 1732 – 31 May 1809) was a prolific Austrian composer of the Classical period. He was instrumental in the development of chamber music such as the piano trio and his contributions to musical form have earned him the epithets "Father of the Symphony" and "Father of the String Quartet". He was a friend and mentor of Mozart, a teacher of Beethoven, and the older brother of composer Michael Haydn.