 "The Harp of Life" (1924), Cowell said, "is another in the suite based on the early Irish mythological opera," as, he explained, were "The Voice of Lir" (1920) and "The Trumpet of Angus Óg" (1918–24).Additional mythic traditions are referenced by "The Hero Sun" (1922), "The Banshee" (1925), and "The Leprechaun" (1928).Cowell also wrote songs of a similarly mythological character, including "Angus Óg (The Spirit of Youth)" (1917) and "Manaunaun's Birthday" (1924).