MUSIC THROUGH THE LOOKING GLASS. By Fritz Spiegl. 325 pp. Paperbound. London: Routledge and Kegan Paul, 1984, $12.95
TWENTIETH CENTURY MUSIC. By Richard Burbank. 485 pp. Cloth. New York: Facts-on-File Publications, 1984, $35.00
THE BEAUX ARTS TRIO: A Portrait. By Nicholas Delbanco. 254 pp. New York: William Morrow and Company, Inc., 1985. $15.95