This study was an investigation of the effects of guided listening upon instrumental music performances of junior college students. The study also sought to discover possible significant relationships between perception and performance variables. It was concluded that the guided listening program was ineffective in improving music performances of junior college students. It was recommended that (a) this study be replicated utilizing string, voice, and piano students, (b) an experimental study be made to investigate the effects of music theory instruction upon music performance, (c) an experimental study be made to investigate the effects of music history instruction upon music performance, and (d) an investigation be made of the Abeles performance constructs interpretation, tone, rhythm-continuity, intonation, tempo, and articulation, in an effort to ascertain ways in which expression of these constructs may be improved.