""Gregorian Chant Accompaniment: A New And Simple Approach According To The Theory Of The Basic Modal Intervals"" by Eugene Lapierre is a comprehensive guide to accompanying Gregorian chant using the theory of basic modal intervals. The book is designed to provide a new and simplified approach to Gregorian chant accompaniment that is accessible to both beginners and experienced musicians.The book begins with an introduction to Gregorian chant and its history, followed by a detailed explanation of the theory of basic modal intervals. This theory is then applied to the accompaniment of Gregorian chant, with practical examples and exercises provided throughout.The author provides a step-by-step guide to accompanying Gregorian chant, covering topics such as melody, harmony, rhythm, and phrasing. The book also includes a section on the use of instruments in Gregorian chant accompaniment, with specific guidance on the use of the organ, piano, and guitar.Overall, ""Gregorian Chant Accompaniment: A New And Simple Approach According To The Theory Of The Basic Modal Intervals"" is an essential resource for anyone interested in Gregorian chant and its accompaniment. The book is written in a clear and concise style, making it accessible to musicians of all levels, and is accompanied by numerous practical examples and exercises to help readers master the techniques of Gregorian chant accompaniment.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.