1. Early period (1792-1802): This period is marked by Beethoven's early influences, including the music of Haydn and Mozart. His works from this period are characterized by their Classical style, with a focus on clear melody and form. Some of the notable works from this period include the First and Second Symphonies, the Piano Sonatas Nos. 1-10, and the String Trios, Op. 9.
2. Middle period (1802-1812): This period is considered Beethoven's most creative and productive. His works from this period are characterized by their emotional intensity, dramatic contrasts, and innovative use of musical forms. Some of the notable works from this period include the Third, Fifth, and Sixth Symphonies, the Piano Sonatas Nos. 11-21, the Violin Concerto, and the opera "Fidelio."
3. Late period (1812-1827): This period is marked by Beethoven's increasing use of complex musical structures and his exploration of new musical ideas. His works from this period are often characterized by their philosophical depth and profound emotional content. Some of the notable works from this period include the Ninth Symphony, the Piano Sonatas Nos. 28-32, the String Quartets Nos. 12-15, and the Missa Solemnis.