Willi Apel's classic study of Gregorian chant is now in paperback. This extensive survey describes the evolutionary processes of its long history as well as its definition and terminology, the structure of the liturgy, the texts, the notation, the rhythm, the tonality, and the methods and forms of psalmody.

A classic and invaluable reference work for over thirty years. Soon after its initial publication, the Harvard Dictionary of Music by Willi Apel was firmly established as a standard and essential resource for everyone concerned with music. The product of exceptional scholarship, it was praised as being comprehensive, concise, authoritative, scholarly, and enjoyable. Leopold Stokowski wrote, I so often consult your dictionary of music, and with such never failing enlightenment, that I must offer you my thanks for your unique book, so profound and so broad in scope ... The vast scholarship......