Neoclassical ballet is usually abstract, with no clear plot, costumes or scenery. Music choice can be diverse and will often include music that is also neoclassical (e.g. Stravinsky, Roussel). Tim Scholl, author of "From Petipa to Balanchine", considers George Balanchine's "Apollo" in 1928 to be the first neoclassical ballet. "Apollo" represented a return to form in response to Sergei Diaghilev's abstract ballets. Balanchine worked with modern dance choreographer Martha Graham, and brought modern dancers into his company such as Paul Taylor, who in 1959 performed in Balanchine's "Episodes".