The purpose of this investigation was to examine the influence of teaching-career level and primary instrument on music teachers' assessment of music performance. The main and interaction effects of three career-level conditions (in-service teachers, upper-division undergraduate students, and lower-division undergraduate students) were examined, along with two primary instrument conditions (brass, not brass), on tone, intonation, melodic accuracy, rhythmic accuracy, tempo, interpretation, and technique/articulation. Participants (N = 150) listened to performances of six junior high trumpet players of various abilities and rated them using the Woodwind Brass Solo Evaluation Form (Saunders & Holahan, 1997). No statistically significant differences were found for the vast majority of interactions or main effects for either career level or instrument condition, suggesting that no relationship exists between teaching-career level and primary performance instrument on the evaluation of music performances.