This groundbreaking textbook on intonation was written in 1962 and is in its 4th revision. This latest edition (11th printing) is printed and published with permission of the author. Mr. Leuba's book offers the student, amateur and professional a detailed study of the Science of Intonation. The standard method of teaching intonation by the intuitive method is discussed and shown to be flawed. This book first addresses the physical and acoustic phenomena relating to the problems of Intonation and Tuning and then makes suggestions concerning the use of mechanical aids in training the musician's perception, and some practical applications.