Stravinsky [Stravéensky], Igor' Fyodorovich (6–5/17–1882, Oranienbaum [now Lomonosov]; 4–6–1971, NY). Cond., pianist, and comp. This exceptionally successful and influential composer enjoyed six decades of significant creative activity that involved major transformations of style while retaining a distinctive underlying unity of spirit. He was the third of four children, all male, born to Anna née Kholodovsky and Fyodor Ignat'yevich Stravinsky, the latter a bibliophile and leading bass singer…