For this volume on low brass instruments in its "Dictionaries for the Modern Musician" series, Rowman & Littlefield turned to Douglas Yeo, a leading US trombone performer/scholar. Formerly bass trombonist of the Boston Symphony Orchestra, Yeo currently teaches trombone at Wheaton College. Like other titles in the series, e.g., Elisa Koehler's Dictionary for the Modern Trumpet Player, this slender volume provides brief, well-researched entries covering myriad aspects of the history and playing techniques of the instruments along with brief biographies of individuals deemed to have "significantly changed the path of [an] instrument's performance, pedagogy, repertoire, research, or manufacturing" (p. 2). Yeo made a particular effort to highlight women, African Americans, and persons of color who contributed in important ways to low brass. No photos are included, but excellent illustrations created by Lennie Peterson, an award-winning artist and educator and a professional trombonist, enhance many entries. All in all, a fine overview of low brass instruments that will be valuable to novices and professionals alike. Essential. Lower-division undergraduates through faculty and professionals; general readers.