Piano Concerto No. 20 in D minor, K. 466, is a classical composition by Wolfgang Amadeus Mozart, completed in 1785. It is notable for its dramatic and emotional depth, featuring a blend of orchestral and piano elements. The concerto is structured in three movements, with the first movement being particularly famous for its intense and dark character. The second movement, Romanze, offers a contrasting lyrical and serene quality, while the final movement returns to a lively and energetic theme. This concerto is one of Mozart's most popular works and has been widely performed and recorded, showcasing the brilliance of both the piano and the orchestra.