In the World of Greyhawk campaign setting for the Dungeons & Dragons role-playing game Heward's Mystical Organ is a powerful artifact, the creation of the hero-deity Heward.
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Heward's Mystical Organ is a massive pipe organ the size of a large room. Playing different keys in specific orders can cause any number of different magical effects.
Heward's Mystical Organ first appeared in the fourth supplement to the original D&D rules, Eldritch Wizardry (1976).[1]
Heward's Mystical Organ was also mentioned in the original 1979 Dungeon Master's Guide.[2] A system to generate magical effects for the musical artifact was given in The Dragon #29 (September 1979) in the "Bazaar of the Bizarre" column.[3]
Heward's Mystical Organ was detailed in the second edition Dungeon Master's Guide (1989).[4] It was further developed in 1993's Book of Artifacts.[5] It also appeared in the fourth volume of the Encyclopedia Magica series (1995).[6]