Approximately 400 entries cover personalities, key performances and events, recordings, musical instruments, essential publications, hit songs, historical and social issues, recording companies, and organizations. Entries are arranged alphabetically, are 100 to 500 words long, and are cross-referenced. Users will also find a selection of photographs of performers, composers, or musical instruments. Unfortunately, there are only about 55 photographs, and the targeted audience would benefit from far more--at least photos of all of the artists covered. The appendixes are a chronology of major events arranged by year, a list of selected recordings to supplement the reading, a short selection of Web sites, and DVD and video recordings. Carlin ends the book with a glossary of musical terms and a list of further readings. The listings for Web sites should have been more inclusive of music downloads and podcasts for the genres, considering the numbers of iPods or MP3 players sold each year to the intended audience.