They are the three skeletons who provide most of the music in the song, "Remains of the Day". They turned into a bass, a saxophone, a xylophone, a guitar, and a trombone. To see them in action, click on the following link. ► https://www.youtube.com/watch?v=nY-FVR1fXqU There are many skeletons in the movie. They can be seen playing pool at the Bone and Socket Pob. The skeletons are also seen dancing and singing before the undead make the wedding cake.