BACH: ESSAYS ON HIS LIFE AND MUSIC. By Christoph Wolff. Cambridge, MA: Harvard University Press, 1991. 00 pp. $45
CAMBRIDGE MUSIC HANDBOOKS: BEETHOVEN: SYMPHONY NO. 9. By Nicholas Cook. 133 pages. Cambridge, England: Cambridge University Press, 1993. $12.95
CAMBRIDGE MUSIC HANDBOOKS: BACH: MASS IN B MINOR. By John Butt. 116 pages. Cambridge, England: Cambridge University Press, 1991. $12.95