SummaryJoseph Haydn was the first of the great triumvirate of Viennese classicists (followed by Mozart and Beethoven). Haydn was a pioneer in forging the Classical style. He ushered in the age of the great symphony and established the string quartet as the quintessential genre of chamber music.The Classical style was brought to artistic maturity in the works of Haydn, Mozart, and Beethoven. It is a style of elegance and simplicity that exhibits clarity, balance, symmetry, proportion.Clarity of phrase structure is a hallmark of the Classical style. Andmusical form is an essential aspect of the Classical style, as well. Theme and variations, rounded binary form, and sonata-allegro form are characteristic forms that we hear in Classical compositions.In this lesson we heard the slow movement from Haydn’s “Emperor” quartet, which is a theme and variations. We became familiar with a Mozart theme from the third movement of his Sonata for Piano in D major, K. 284, which is a rounded binary form.We were introduced to the instruments of a contemporary woodwind quintet by members of our performance faculty and heard their performance of Haydn’s Divertimento in B-flat major. The first movement of the Divertimento, which is a sonata-allegro form, provided an initial point of comparison between rounded binary form and sonata-allegro form.And we were introduced to a chromatic predominant harmony—the Augmented sixth chord—that came to prominence in the Classical style.