Diaghilev and the Ballets Russes, by Boris Kochno (oversized HC, 1970, $7.50, which is 1/3 the current internet price)
I had never heard of this gentleman before, but I may be the only one. He organized artists, including Picasso, Miro and Ernst, to create costume and set designs for his theaters. He introduced Milhaud and Stravinsky's music to new audiences. Balanchine, Nijinsky, and Rubinstein all danced for him in his theaters. It is hard to envision all that talent working for just one man. I am sure we all wish we were alive to have seen even one of the events he organized.
Look for this book in the dance section.