Sowerby, Leo (sōˈərbē) [key], 1895–1968, American composer and organist, b. Grand Rapids, Mich. Sowerby studied at the American Conservatory, Chicago, and with Percy Grainger. In 1921 an American Prix de Rome was created to enable him to study in Rome. In 1925 he became teacher of composition at the American Conservatory and in 1927 organist and choirmaster of St. James Episcopal Church, Chicago. A prolific composer, he wrote such important works as A Set of Four (1917), Symphony in B Minor (1927), and Symphony in F Sharp Minor (1940), for orchestra; a concerto (1938), for organ and orchestra; the oratorios The Vision of Sir Launfal (1925) and The Canticle of the Sun (1944); and Symphony in G (1932), for organ.