SCHUBERT'S SONGS, A BIOGRAPHICAL STUDY by DIETRICH FISCHER-DIESKAU Translated by KENNETH S. WHITTON 333 pages. Knopf. $12.50.
Dietrich sings lieder. Fischer is the Bach specialist. And Dieskau stars in opera. So goes the legend of the most subtle, intellectual and prolific baritone of the past 25 years. If there is a Kunstlied (art song) Dietrich Fischer-Dieskau has not recorded in that mellifluous, burnished voice, it is not worth the vinyl. He has of late taken up conducting, and his lyric versions of Schubert's Symphonies Nos. 5 and 8 ("Unfinished") can be found on...