Wilhelmina Frankfurt & David Richardson. Photo by Martha Swope, 1976. NYPL In 1976 at the Maurice Ravel Festival, Balanchine premiered the ballet, “Le Tombeau de Couperin.”  Anna Kisselgoff declared, this ballet was, “was the masterpiece of the [Ravel] Festival, a ballet that deserves to endure with the best of the Balanchine repertory and one whose creative and intellectual underpinnings are first-rate. “In ‘Le Tombeau de Couperin,’ Mr. Balanchine has used the 18th-century c