"Mountain King" is a popular piece of classical music composed by Edvard Grieg in 1875. It is the final movement of his suite titled Peer Gynt, which was originally written for a play by Henrik Ibsen. The music is known for its lively tempo and dramatic themes, capturing the essence of a mythical mountain king and his realm. The piece is often performed by orchestras and is recognized for its energetic rhythms and vivid imagery. It has been featured in various films, commercials, and other media, making it a well-known work in the classical repertoire.