Three masterpieces by George Balanchine. Concerto Barocco, 1941—Gödel, Escher, and Bach go to the ballet. The Four Temperaments, 1946—Masaccio’s Expulsion meets MoMA in a sexy, sweeping invocation of Modernism. Serenade, 1934—Fokine’s Les Sylphides, but through a glass darkly. —L.J.