RETROSPECTIVES AND CONCLUSIONS by Igor Stravinsky and Robert Craft. 350 pages. Knopf. $7.95.
According to Robert Craft, Igor Stravinsky's recording angel, Retrospectives and Conclusions is the last in the series of "diary books" that began in 1959. Together, these collections of interviews, essays on music and reviews make up an extraordinary loose-leaf monument to the 20th century's leading composer. Professionally speaking, Stravinsky has always been brilliant but baffling. A fierce and uncompromising pioneer who quite literally revolutionized the music of his century, he was also as modishly conscious of musical fashions as...