It's three Dictionaries in one; A Dictionary of Music Terms, A Dictionary of Musicians and a set of Reference Charts. The Music Dictionary defines over 2,200 music terms, including notation and terms used in theory, pop music, electronic music and the general music business. The Dictionary of Musicians provides more than 400 capsule biographies of composers and other musicians and the Reference Charts give instant at-a-glance summaries of other essentials of music such as vocal ranges, notation signs and symbols, scales, modes and key signatures. All this in a convenient 10 x 14 cm take-anywhere size.