Franz Joseph Haydn (1732-1809) was a foundational figure in the development of the Classical symphony, string quartet, and keyboard sonata. Working for decades as Kapellmeister at the Esterházy court in Hungary, Haydn wrote across every major genre and was known for his inventiveness, humor, and structural clarity. His influence on Mozart and Beethoven cannot be overstated; he essentially shaped how composers thought about form and harmonic language.
For choral directors, Haydn's vocal writing offers clean part writing, singable lines, and the kind of structural inevitability that engages both performers and listeners. His sacred and secular choruses demonstrate how melodic wit and contrapuntal skill can work together without becoming burdensome.