West Side Story is one of the few Broadway musicals that can make a genuine claim to transforming the genre. Nigel Simeone begins by exploring the long process of creating West Side Story, including a discussion of Bernstein's sketches, early drafts of the score and script, as well as cut songs. The core of the book is the commentary on the music itself. West Side Story is one of the very few Broadway musicals for which there is a complete published orchestral score, as well as two different editions of the piano-vocal score. The survival of the original copied orchestral score, and the reminiscences of Sid Ramin and Irwin Kostal, reveal details of the orchestration process, and the extent to which Bernstein was involved in this. Simeone concludes by placing West Side Story in the context of Bernstein's oeuvre as well as considering the lasting impact and reputation of the show.