Book excerpt: Revised and expanded, A Performer's Guide to Seventeenth Century Music is a comprehensive reference guide for students and professional musicians. The book contains useful material on vocal and choral music and style; instrumentation; performance practice; ornamentation, tuning, temperament; meter and tempo; basso continuo; dance; theatrical production; and much more. The volume includes new chapters on the violin, the violoncello and violone, and the trombone—as well as updated and expanded reference materials, internet resources, and other newly available material. This highly accessible handbook will prove a welcome reference for any musician or singer interested in historically informed performance.