weinstock died in new york city at the age of 65 following an operation. at the time of his death he was working on a biography of gluck. in his review of weinstock's bellini biography, alan rich wrote that his qualities as a biographer "combined the story‐teller's gift with an enthusiasm for great works of art that made weinstock the envy of all who knew him." he also wrote that as the music editor at knopf, weinstock "was responsible for guiding into print some of the best, most readable and most important writing about music" that the 20th century had produced.