What are Characteristics of Franz Joseph Haydn's music?

Answer 1

Deviating from the counterpoint style in Baroque period, Haydn wrote many of his compositions in Galant style. He was the pioneer in emerging the string quartet genre. His introduction to classical style is well illustrated by his 104 symphonies and 84 string quartets.

Answer 2

His music reflected his own disposition- optimistic; cheerful; playful. That is perhaps why he hardly ever composed in the minor key.