THE OPERAS OF VERDI: Volume Two (From Il Trovatore to La Forza del Destino). By Julian Buden. 532 pp. New York: Oxford University Press, $39.95
THE SYMPHONIES OF HAVERGAL BRIAN, Volume One (Symphonies 1-12) and Volume Two (Symphonies 13-29 and the Concerto for Orchestra). By Malcolm MacDonald. 207 and 288 pages. • New York: Taplinger/Crescendo, $11. • 95 and $13.95