Haydn provided the compositional model upon which subsequent generations of composers largely based their own symphonies. read more
But you asked why Haydn was called the Father of Symphony, and that presupposes that somebody actually did call him that.. Whoever called Haydn the 'Father' was probably [i] not very well informed. [ii] trying to trick you [iii] pronounced 'C.P.E. Bach' so badly that people thought he was saying 'Haydn'. read more
Franz Joseph Haydn (March 31, 1732 – May 31, 1809) was an Austrian composer. He was one of the most important, prolific and prominent composers of the classical period. He is often called the “Father of the Symphony” and “Father of the String Quartet” because of his important contributions to these genres. read more