  Conflict and consolidation marked the last decade of Adorno's life. A leading figure in the “positivism dispute” in German sociology, Adorno was a key player in debates about restructuring German universities and a lightning rod for both student activists and their right-wing critics. These controversies did not prevent him from publishing numerous volumes of music criticism, two more volumes of Notes to Literature, books on Hegel and on existential philosophy, and collected essays in sociology and in aesthetics. Negative Dialectics, Adorno's magnum opus on epistemology and metaphysics, appeared in 1966. Aesthetic Theory, the other magnum opus on which he had worked throughout the 1960s, appeared posthumously in 1970. He died of a heart attack on August 6, 1969, one month shy of his sixty-sixth birthday.