Piano Sonata No. 14 in C-sharp minor, Op. 27, No. 2, commonly known as the "Moonlight Sonata," is a famous piano composition by Ludwig van Beethoven. Completed in 1801, it consists of three movements, with the first movement being particularly well-known for its dreamy and melancholic character. The sonata is notable for its innovative structure, as the first movement is marked "Adagio sostenuto," creating a serene atmosphere. The second movement, "Allegretto," provides a contrast with a lighter, more playful feel, while the final movement, "Presto agitato," showcases Beethoven's dramatic and intense style, culminating in a powerful conclusion.