New York City Ballet

Choreographer George Balanchine work in a dance studio with Igor Stravinsky and dancers during the production of ''Agon'' in 1957.

Choreographer George Balanchine teaches a ballet class at the School of American Ballet in the early 1960s. Also distinguishable are Patricia Wilde, Maria Tallcheif, Kay Mazzo, Suzanne Farrell, Melissa Hayden and Jacques d'Amboise.

Choreographer George Balanchine works with two children on ''Don Quixote'' and Karin von Aroldingen and Jean-Piere Bonnefous perform in his ''Violin Concerto.''

Choreographer George Balanchine (center) works with his principal dancers Patricia McBride and Mikhail Barishnikov as they prepare to dance in ''Choreography by Balanchine, Part 3.''

2 photographs on one sheet: (left) portrait of renowned choreographer Jerome Robbins. (right) Joseph Duell, Kipling Houston and Jean-Pierre Frohlich perform in Robbins' ''Fancy Free'' as part of the Great Performances Dance in America special ''choreography by Jerome Robbins with the New York City Ballet.''

Photographs of dancer and and choreographer Jerome Robbins performing in his own work ''Fance Free.''

Two images on one sheet: (Left) Edward Villella and Patricia Mc Bride, both of the New York City Ballet, perform in Geroge Balanchine's ''Tarantella'' in Berlin, Germany as part of the PBS television seris ''Great Performances. (Right) Informal portrait of New York City Ballet choreographer George Balanchine.