The human voice does not make use of keys like a piano to produce specific sounds. Therefore, reliable strategies are necessary when a singer has to sight-read the score. The following method is dedicated to singers and voice students with at least a little experience, who desire to enhance their sight-singing skills, learn to sing in tune harmonizing with other voices or with the instrumental accompaniment, and be able to sing any interval in order to confront the most challenging pieces, even those from the atonal repertoire. This book consists of 73 individual and ensemble (two- to four-part) exercises focusing on the identification and execution of all intervals.