In England it is the smallest trooping fay who are called elves and the
name is applied particularly to the small faerie boys.
The elves emrge at night and sing and dance in the light of the full moon,
their beautiful music is said to bring the trees and rocks to life so that they too will
dance under the moon.
Any mortal that hears the tune 'The Elf King's Reel' will fall under the spell
and dance until the morning, the only way to break the enchantment is to cut the
strings of the fiddle.
Faeries and Folklore of the British Isles