The author demonstrates that from around the fourth to the mid-twelfth centuries there were ten different musical rhythms, and that sometimes several might be used within a single piece. The argument is drawn from years of transcribing neumatic and diastematic chant manuscripts, rhythmizing eleventh and early-twelfth-century polyphonic pieces, and performing in concerts and liturgies. The book is illustrated by thirty musical examples of chant, liturgical drama, and polyphony, each accompanied by commentary and translation. Fifteen of these examples, including two complete Mass Propers and two complete liturgical dramas, are illustrated with twenty-six MP3-embedded audios in performances by the Schola Antiqua; for these, Adobe Acrobat 9 or higher is required. Two photographs, nine reproductions from manuscripts, and one icon facsimile adorn the text. The book is being published now, online, in PDF: download this 116-page book [120 MB]. The Table of Contents is to be found on page 9, and instructions for listening are given on page 17.
The book is also downloadable in hard copy, and its pages have been designed to be printable back-to-back and bound in book form.