Oscar Hammerstein II Mathias by his first wife, and James Hammerstein by his second wife, with whom he also had a stepdaughter, Susan Blanchard. Hammerstein was one of the most important "book writers" in Broadway history – he made the story, not the songs or the stars, central to the musical and brought musical theater to full maturity as an art form. According to Stephen Sondheim, "What few people understand is that Oscar's big contribution to the theater was as a theoretician, as a Peter Brook, as an innovator. People don't understand how experimental "Show Boat" and "Oklahoma!" felt at the time they
Rodgers and Hammerstein Although there are exceptions to this generalization, it simplifies the audition process, and gives audiences an idea of what to expect vocally from a Rodgers and Hammerstein musical. However, this formula had been used in Viennese operetta, such as "The Merry Widow". William A. Everett and Paul R. Laird wrote that "Oklahoma!", "like "Show Boat", became a milestone, so that later historians writing about important moments in twentieth-century theatre would begin to identify eras according to their relationship to "Oklahoma!"" In "The Complete Book of Light Opera", Mark Lubbock adds, "After "Oklahoma!", Rodgers and Hammerstein were the most important contributors