Wolfgang Rihm composed an opera, "Dionysos", and compiled his own libretto from the "Dionysian Dithyrambs". No contests for satyr plays, nor for the singing and dancing of dithyrambs, were included. Thespis was a singer of dithyrambs (songs about stories from mythology with choric refrains). Instrumental dithyrambs were composed by Robert Volkmann and Hermann Ritter. According to the Suda, Melanippides wrote lyric songs and dithyrambs. In his "Poetics," Aristotle links the origins of tragic drama to dithyrambs. Dithyrambs are rare in English language literature. Dithyrambs featured choirs ("choros)" of men and boys who were accompanied by an aulos player.