Introduction
The Introduction to this volume explores the importance of individual–world interactions through the medium of sound in distinguishing between different traditions of Christian worship. I introduce ideas of musicking and resonance and suggest their potential usefulness in exploring the different patterns of interaction present in musical acts of devotion. I draw attention to resonance’s ability to point toward the simultaneous or subsequent sounding of energy in and between multiple actors, entities, and spaces, and to its particular conceptual advantages and strengths in approaching congregational singing. I highlight its ability to foreground the materiality of music while simultaneously giving conceptual space for the overtones latent within and surrounding such materiality. Alongside this, it is able to offer a relatively loose sense of priority that evokes very strongly complex dynamics of interplay back and forth between numerous agents, spaces, things, and materials as energy and vibration are passed between them.