Music instruction can now be adapted more effectively to students' individual differences and curriculums can be developed to meet particular class needs, as a result of the original research by Professor Gordon which concentrates on the basic areas of tonal and rhythm concepts. More than 10,000 grade-school students across the United States participated in three years of testing which produced the data interpreted in this new book. Presented in terms of current learning theories applied to music, an attempt is made to provide for musical instruction grounded on research.