Joseph Haydn was a baroque era composer.  He was born on March 31, 1732 and died May 31, 1809. Called “Father of the String Quartet” and was instrumental to the piano trio, considered the genesis of the sonata form.  Of his 3 brothers, Michael Haydn, was also an accomplished composer & Johann Evangelist Haydn, a virtuoso tenor.  Besides his own compositions, he taught both Wolfgang Amadeus Mozart and Ludwig van Beethoven.