The document provides information about the Classical music era from 1750-1820 including important composers such as Haydn, Mozart, and Beethoven. It discusses the symmetrical forms and balance in music during this time period. It also describes the patronage system where composers worked for royalty. Specific works by the composers like Haydn's "Surprise Symphony" and Mozart's "Marriage of Figaro" are summarized. Beethoven's deafness and iconic 5th Symphony are also mentioned. Important world events during this era are listed at the end.