Piano Sonata No. 30 in E major, Op. 109, is a composition by Ludwig van Beethoven, completed in 1821. It is the first of his last three piano sonatas and is known for its lyrical melodies and innovative structure. The sonata consists of three movements, with the final movement featuring a theme and variations that showcase Beethoven's creativity and emotional depth. The first movement is marked by a serene and flowing character, while the second movement is more energetic and lively. The final movement, with its contrasting themes, highlights Beethoven's ability to blend complexity with beauty, making this sonata a significant work in the classical piano repertoire.