The purpose of this study was to examine the ways in which a professional learning community (PLC) of music teachers sustained growth as they sought to incorporate Comprehensive Musicianship Through Performance (CMP) in their teaching practices. Seven music teachers from a suburban school district in the upper Midwest participated in a PLC as they incorporated CMP into their bands, choirs, and orchestras over a 2-year period of data collection. Findings of this collective case study describe the process of implementing CMP, reinforce the importance of a collaborative culture, and consider the impact of emotional aspects related to teacher change and shifts in teacher knowledge as a result of participating in this learning community. Particular challenges included implementing CMP amid performance expectations of technical proficiency and shifting emphasis from solely performance to performance and understanding. While findings suggest that incorporating CMP can have a positive impact in school ensembles, moving away from established performance routines and expectations can be daunting for veteran as well as novice teachers.