What were the two most important developments in joseph haydn's lifetime?

During Joseph Haydn's lifetime, two significant developments were the rise of the Classical Music era and the establishment of the symphony and string quartet as prominent musical forms. The Classical era emphasized clarity, balance, and form, with Haydn playing a pivotal role in shaping these styles. Additionally, the patronage system evolved, with Haydn serving under the Esterházy family, allowing him to experiment and innovate, ultimately influencing the broader musical landscape of the time.