Piano Sonata No. 1 is a classical music composition by Sergei Prokofiev, completed in 1909. This sonata is known for its innovative structure and expressive melodies, showcasing Prokofiev's unique style. It consists of four movements, each with distinct character and mood, ranging from playful to introspective. The sonata is often performed in concert settings and is appreciated for its technical challenges and emotional depth. It reflects the early 20th-century transition in music, blending traditional forms with modern elements. Piano Sonata No. 1 remains a significant work in the piano repertoire, highlighting Prokofiev's contribution to classical music.