Book excerpt: Today's musical theatre world rocks. Now that rock 'n' roll music and its offshoots, including pop, hard rock, rap, r&b, funk, folk, and world-pop music, are the standard language of musical theatre, theatre singers need a source of information on these styles, their origins, and their performance practices. Rock in the Musical Theatre: A Guide for Singers fills this need. Today's musical theatre training programs are now including rock music in their coursework and rock songs and musicals in their repertoires. This is a text for those trainees, courses, and productions. It will also be of great value to working professionals, teachers, music directors, and coaches less familiar with rock styles, or who want to improve their rock-related skills. The author, an experienced music director, vocal coach, and university professor, and an acknowledged expert on rock music in the theatre, examines the many aspects of performing rock music in the theatre and offers practical advice through a combination of aesthetic and theoretical study, extensive discussions of musical, vocal, and acting techniques, and chronicles of coaching sessions. The book also includes advice from working actors, casting directors, and music directors who specialize in rock music for the stage.