Let's Play Might and Magic VI: The Mandate of the Fire Lord (e12)
Channel: aetherspoon
Date: 2018-10-18

According to Wikipedia, "In the Hall of the Mountain King" (Norwegian: I Dovregubbens 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 is also the music stuck in my head every time I visit the dungeon at the second 2/3rds of this video..