The Mask of Orpheus Orpheus must travel through is given a symbolic name. At the start of this act, time is moving backwards: Orpheus travels back out of and into the Underworld, and Euridice dies once more. Then time moves forwards as Orpheus leaves the Underworld again. One version of the Orpheus story is that he is then killed by a thunderbolt thrown by Zeus, while another is that he is dismembered by the women of Dionysus. Orpheus then becomes the subject of a cult and an oracle. Time flows backwards once more, and Orpheus' death is acted out again, and the opera ends
The Mask of Orpheus with the Orpheus myth decaying. "The Mask of Orpheus", in addition to vocal and orchestral music, contains a significant amount of electronic music, (which was precisely composed by Birtwistle, and realized on his behalf by Barry Anderson). Each act has its own electronic "aura", which goes on continuously, sometimes prominently, sometimes inaudibly; the voice of Apollo is heard on several occasions as an electronic sound "speaking" in an invented language. These electronic sounds were made by Anderson in Paris at IRCAM. There are also six purely electronic interludes created by computer manipulation of harp sounds. Jocelyn Herbert was commissioned to