The Music Room

The Music Room is where an invisible ghost plays a Rachmaninoff-style arrangement of Grim Grinning Ghosts on the piano. The ghost's shadow can be seen cast upon the floor.

According to Jason Surrell, in his book The Haunted Mansion: From the Magic Kingdom to the Movies, the invisible pianist is the Ghost Host.

During the Haunted Mansion Holiday Nightmare in Tokyo, the piano is played by the Vampire Teddy Bear, while Sally sits in a nearby chair, listening.