Exercises, examples, and recordings referenced in the volume are available online. In addition to offering insight into the characteristics and style of barbershop singing, the book includes a glossary of terms pertinent to the genre. Seven appendixes present lists of resources, champion groups, advice for warming up, learning music, and performance in general. The last appendix is devoted to barbershop humor, and contains jokes and anecdotes about the singers and the style. Singers interested in this genre will appreciate the clear sighted and concise overview presented by Clark and Biffle.