Scholars have often highlighted the intrinsic features of technology to support the generation and sharing of ideas (Craft 2011). By studying user interactions within informal online communities, researcher can elucidate the ways technology impacts creativity and learning within these groups. This qualitative content analysis (Hsieh and Shannon 2005) used a systems-based approach to creativity (Csikszentmihalyi 1999) to examine the interactions within an online community (Noteflight) focused on Western standard music notation-based composition. One popular, publicly available, original musical score was selected. Online comments were collected and analysed. Findings highlight the diversity and abundance of feedback given to the composer as well as the many ways users engaged with domain knowledge. This online community allows individuals to share knowledge, learn about the social norms associated with giving feedback, and explore creative ideas regarding music composition. Implications from this study highlight the ways music educators and technology designers can develop web-based music learning environments that support creativity and life-long engagement.