This study's purpose was to investigate the kinds of instructions provided for teachers by authors and publishers of elementary music series for the development of children's voices. Specifically, the study was 1. to investigate the recommended methodology related to the development of vocal concepts in children, 2. to investigate musical aspects that could be indicators of expected vocal ability in children, and 3. to relate the findings of this study to other research results that give insight into the vocal capabilities of children. To collect the data, the teacher's editions of grades one, three, and five of music series published by the Silver Burdett Company and by the American Book Company during the period circa 1945 to 1975 were subjected to a content analysis and to a musical analysis. Three categories were established for the content analysis: Vocal Characteristics, Singing Objectives, and Teaching Strategies. Validity of the research tool was tested by the jury method and by logical validity. Reliability coefficients of .90 were determined by using two additional coders and by re-coding material.