"Sound Links" examines the dynamics of community music in Australia, and the models it represents for informal music learning and teaching. This involves researching a selection of vibrant musical communities across the country, exploring their potential for complementarity and synergy with music in schools. This article focuses on the most significant themes that have emerged from the author's recent "Sound Links" fieldwork in four musical communities across Australia. Drawing on insights from well over 300 community music practitioners, participants, educators, and administrators, it will touch on the critical success factors, key challenges, learning dynamics and models for community-school collaborations found in these diverse community settings. These themes will be interwoven with ideas and concepts from community studies in the humanities and community music literature to provide a range of insights into the social, cultural and educational dynamics of musical communities in Australia.