The New York Times has an article describing this Balanchine masterpiece as a perfect introduction to ballet. I've seen it live three times (and Rubies once more). I have the full ballet performed by the Paris Opera Ballet (good but no match) and excerpts performed by NYCB in the 1970's on Dance in America. There's also a video of the Mariinsky, which I haven't seen.
Music is by Faure, Stravinsky and Tchaikovsky.