Yan Tan Tethera (opera)

Yan Tan Tethera is a chamber opera (subtitled A Mechanical Pastoral) by the English composer Harrison Birtwistle with a libretto by the poet Tony Harrison, based on a supernatural folk tale about two shepherds, their sheep, and the Devil. It was first performed at Queen Elizabeth Hall, London, on 7 August 1986. The title comes from a traditional way of counting sheep.