George Moore involved W. B. Yeats personally in the revision of a novel of Moore's that contained a character based on Yeats; this involvement led to the pair's collaboration in writing a play based on Diarmuid and Grania, one of the best-known tragic tales of Celtic mythology. At the late stages of composition, the authors decided to add songs, and Edward Elgar provided the music. The play opened at the Gaiety Theatre in Dublin on October 21,...