A "Rondo" is a musical form characterized by a recurring theme that alternates with contrasting sections. Typically found in classical music, it often follows an ABACA or ABACABA structure, where "A" represents the main theme and "B" and "C" are different sections. This format creates a lively and engaging listening experience, making it popular in various compositions. Rondos are commonly used in the final movements of sonatas, symphonies, and concertos. Famous examples include the final movement of Beethoven's Piano Sonata No. 8 and Mozart's Piano Concerto No. 21. The repetitive nature of the Rondo allows composers to showcase their creativity while maintaining a familiar anchor for the audience.