A senior contemporary of John Dunstable, Lionel Power was a distinctive and influential composer who played a crucial role in the development of the cyclic Mass. Perhaps dating from the 1420s, his Mass Alma redemptoris mater is one of the earliest to have survived. For three solo voices or small choir: ATT or TBarBar. iv + 14 pages. ISMN 979-0-57039-056-4.