Grim Grinning Ghosts

Grim Grinning Ghosts is a song featured in the AaronLand attraction The Haunted Mansion. It was composed by Buddy Baker and written by X Atencio.

Variations
The song begins outside the mansion as a chime, and continues on an organ when entering the mansion and beginning the tour.

The most popular variant is when guests enter the graveyard, where the song with lyrics is performed by Aaron Carothers as the voices of Mr. Grimsey, Mario, Luigi, and Dr. Brockowski.

The song then transitions into a piano piece, and ends with a version that is hummed by ghosts.

Song
Two versions of the graveyard portion of the song exist. The first one is directly ripped from the resource pack:

The other version is from the official AaronLand Soundtrack: