Although several lines of research (e.g., deliberate practice, mental practice, modeling, self-regulation) have begun to show links between general practicing approaches and achievement, relatively little is known about which specific behaviors are most effective in eliciting performance gains. Information regarding which behaviors are beneficial to school-age musicians is especially needed, given their often limited formal training and the scarcity of studies with this population. The purpose of this study was to examine relationships among observed practice behaviors, self-reported practice habits, and the performance achievement of high school wind players.