Ludwig van Beethoven primarily composed in the genres of classical and romantic music, encompassing symphonies, sonatas, and chamber music. His work is often divided into three periods: the early period, when he was influenced by classical composers like Haydn and Mozart; the middle period, known for its dramatic and intense works; and the late period, marked by innovative compositions that pushed the boundaries of musical form and expression. Beethoven's pieces, such as the "Symphony No. 9" and the "Piano Sonata No. 14" (Moonlight Sonata), are celebrated for their emotional depth and complexity, significantly impacting the development of music.