In the Hall of the Mountain King
"In the Hall of the Mountain King" (Norwegian: "I Dovregubbens hall", lit. 'In the Dovre man's hall') is a piece of orchestral music composed by Edvard Grieg in 1875 as incidental music for the sixth scene of act 2 in Henrik Ibsen's 1867 play Peer Gynt. It was originally part of Opus 23 but was later extracted as the final piece of Peer Gynt, Suite No.
Source: Wikipedia — In the Hall of the Mountain King (CC BY-SA 4.0)