Choreographed in 1968 and set to Leo Delibes exquisite musical score, La Source vividly recreates the elegant milieu of 19th-century French ballet. As an example of Balanchines acclaimed pink ballets, this charming nostalgic work continues to enchant 21st-century audiences with its subtle beauty and bravura performances. Two couples one classical, one modern engage in a provocative study of choreography contrast and collision in Peter Martins stirring and quirky Barber Violin Concerto, the excitement of which is enhanced by Samuel Barbers neo-romantic Violin Concerto, one of the most melodically alluring and widely performed concertos of the 20th century. Set to Phillip Glass driving postmodern score, Twyla Tharps signature work In The Upper Room deftly fuses seemingly divergent dance aesthetics. Modern dances forceful energy is juxtaposed with the finesse of the classical tradition, both fiercely surging towards a spectacular climax.