Though the arrangement of its pipes are quite different, the ornate organ found in the Haunted Mansion's Ballroom is the same one used in the 1954 Walt Disney feature, 20,000 Leagues Under the Sea.
The oversized organ currently plays the eerie & upbeat Grim Grinning Ghosts, the Haunted Mansion's official theme. In the 1954 Disney classic, Captain Nemo plays a haunting version of J.S. Bach's Toccata and Fugue in D Minor.