Which genre was the most important to classical era composers

Unlike the Renaissance or Baroque eras, which included many important composers and trends, the choral music of the classical era was dominated by three composers: Franz Joseph Haydn (1732-1809), Wolfgang Amadeus Mozart (1756-1791), and Ludwig van Beethoven (1770-1827).

Because most artists loved the way that their men or women that they were to paint/sculpture just the way that they had when they sat and posed and they thought that it looked more i guess