What Dreams May Come in the book are derived from my wide range of reading." One of Matheson's influences was Harold W. Percival, an adherent of Theosophy, a belief system with a strong Eastern and Hindu influence. The story also shares the same theme of the ancient Greek myth Orpheus and Eurydice, in which the gifted musician makes a challenging journey to Hell to retrieve his wife. One character quotes from the writings of 18th century Christian mystic Emanuel Swedenborg. Matheson bases his descriptions of the death experience itself on studies by Elisabeth Kübler-Ross and Raymond Moody. When reading these accounts, Matheson found that
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