Lisa: No, Dad, you mean "xenophobia". Xylophobia would be the fear of xylophones.
Homer: I am afraid of xylophones. It's the music you hear when skeletons are dancing!
For the proper reading experience, play the music from this video while reading on.
It seems that a lot of works have featured xylophone music to go along with skeletons. This is especially true wherever skeletons are featured dancing. Often (especially in 1920s - 50s animation) this would be because a skeleton's rib cage would be played as a xylophone, and as a result, the association between skeletons and xylophones has stuck.
The music is usually played In-Universe by having a character hit a skeleton's bones, often the ribs, with mallets of some sort. It may even be a Skeletal Musician playing their own bones. However, this isn't always the case. As long as it's a scene with skeletons or bones that uses xylophone music in some way, it counts.
The song "Dem Bones" is commonly played, due to it being about skeletons. While most people know it only as a fun Halloween song, it's actually connected to The Bible - specifically, Ezekiel 37:1-14, in which Ezekiel visits the Valley of Dry Bones (no, not those Dry Bones), and prophesizes that God will resurrect the skeletons there. The song's bouncy melody and cheerful mood make it perfect for a xylophone rendition.
- Eddie Potter, a comic strip from The Dandy had a strip where the titular character holds Pop Idol style talent show auditions at his school, which is populated by macabre creatures including werewolves and living skeletons. One of the acts involves a group of skeletons using their own bones as musical instruments.
- "Remains of the Day" from Corpse Bride is sung by a Skeletal Musician and heavily features xylophone music. There's even a part where some dancing skeletons play each others' ribcages!
- The Lion King: A xylophone can be heard throughout "Be Prepared", but while bones are seen throughout, there aren't any living skeletons One quick scene does come close, though: two hyenas are playing with some skeletons, pretending to make them dance. There's also a hyena playing the xylophone part on a ribcage.
- In Phineas and Ferb The Movie: Across the 2nd Dimension, Doofenshmirtz and his alternate dimensional self does a musical, in which at one point they both played xylophone music on a creature's ribcage.
- The 7th Voyage of Sinbad: Frantic xylophone music plays when Sinbad fights the animated skeleton.
- Sent up in the Discworld, when in Soul Music, Susan Sto Helit recalls a visit to her grandfather as a child. She asked for a xylophone: her grandfather took his robe off and gave her two little hammers. It began to dawn on her that there was something odd about your grandfather being an animated skeleton, as Death is usally depicted.
- "Spooky Scary Skeletons" by Andrew Gold uses xylophone prominently, fitting for a song about creepy skeletons. The song's many remixes, despite changing the genre, still usually incorporate the xylophone.
- Camille Saint Saens wrote two pieces that serve as the Trope Codifier:
- In Igor Stravinsky's music to The Firebird, the xylophone part mostly serves to emphasizes the sinister aspects of Koschei the Immortal and his monstrous Evil Minions. The xylophone gets a big workout in "Dance of Koschei's Retinue."
- In Cuphead, the second phase of the Phantom Express boss fight pits Cuphead against the trains conductor, a giant skeleton. Xylophone music plays when you defeat him.
- Donkey Kong Country Returns: The Cliff world, which makes use of a xylophone in its music, is filled with dinosaur bones, big and small, some still alive. The Tiki found there plays xylophone music and resembles the skeleton of a trilobite. His name? Xylobone.
- I Spy Spooky Mansion, which stars a mischievous skeleton who traps the player in the titular mansion, uses xylophone music prominently.
- In King's Quest VI: Heir Today, Gone Tomorrow, Alexander can gain entry to the land of the dead by using a convenient stack of bones as a xylophone to play "Dem Bones" and make the skeleton guards dance.
- In Monkey Island 2: LeChuck's Revenge, Guybrush suffers a Disney Acid Sequence in which the skeletons of his parents dance and sing to a jaunty xylophone rendition of "Dem Bones".
- Dry Bones, the skeletal enemies from the Super Mario Bros. games, make xylophone-like sounds.
- In Yooka-Laylee, the living skeleton Clara's Speaking Simlish sounds like a marimba.
- One episode of Animaniacs has the Warner Siblings sing a song about the structure of the human skeleton. When they reach the chest, there's a brief instrumental break as one of them plays the ribcage like a xylophone.
- The Mad Doctor uses xylophone music in some of the skeleton scenes. It's mainly used to play quick notes indicating the skeletons' movements.
- Discussed in a couple of different The Simpsons episodes where Homer remarks that he's afraid of xylophone music because of its association with dancing skeletons.
- The Skeleton Dance features skeletons dancing to March of the Dwarfs by Edvard Grieg, which features xylophone in some parts.
- Doubles as a Mythology Gag in The Lion Guard's pilot episode. In the song, "Zuka Zama", Bunga is seen playing an animal's skeleton like a xylophone, similar to a background hyena in the above mentioned Lion King movie, which the show is a spin-off from.