The problem of this study was to determine the cognitive development sequence of music skills. This sequence was determined by finding the music skills level, the Piagetian developmental level, and the developmental art level for twelve students differing in reading ability and in the first through fourth grades.The students were individually tested, using Piaget's semi-clinical interview technique. The students were tested on seven Piagetian tasks, ten music tasks, and one art task. The validity was determined through the interview process. The examiner redirected questions until he was certain the subjects were responding from conviction. The reliability of the study was achieved through a test-retest procedure and impartial expert evaluation of the test sessions.