I. For Ernst Krenek at eighty-five (23 August 1900) -- II. For Henri Dutilleux at eighty (22 January 1916) -- III. For Oliver Knussen at forty (12 June 1952) -- IV. For Gunther Schuller at seventy (22 November 1925) -- V. For Richard Swift at sixty (24 September 1927) -- VI. For Leonard Bernstein at seventy (25 August 1918).