Abstract
768 sixth-grade students enrolled in eight separate middle schools in the cities of Odessa, Henderson, and Gladewater, Texas, were given the Tonal Imagery and Rhythm Imagery tests from the Musical Aptitude Profile along with the complete Measures of Musical Abilities battery. After a year and a half of instrumental study, Music Achievement Test, Part 2 and Iowa Tests of Music Literacy, Level One were administered to all students remaining in the programs. Results of the study indicated the MAP Tonal Imagery was the most efficacious of the aptitude tests, while the ITML battery possessed the highest validity for measuring music achievement, based on teachers' subjective performance ratings. Interrelationships among certain achievement subtests were rather high, indicating that in some cases two subtests were measuring similar areas of achievement. Using these as a guide, it was possible to select a group of subtests from both the MAT and ITML batteries that were relatively unrelated and at the same time agreed satisfactorily with the teachers' professional judgments of their students.

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