This book is a survey of Broadway musicals all through the 20th century, from the Tin Pan Alley-driven comedy works of the early part of the century, to the integrated musical plays that flourished in the heyday years of midcentury, and to the rock era, concept musicals, and the arrival of British mega-musicals late in the century. It also profiles some of the theater world's leading composers, writers, and directors, considers some of the most unforgettable and forgettable shows, illustrates the elusive fragility of the libretto, explains the compensating nature of production elements, and examines representative shows from every decade. An extensive discography offers a brief critique of more than 300 show cast albums.