The goal of this master thesis was to explore how proxemic interaction principles could assist users in the interaction with multi-room music systems. In reponse, AirPlayer was developed, which is a prototype multi-room music system that utilizes proxemic principles in the interaction design. This master thesis covers the design and implementation of AirPlayer, which is based upon a technical framework developed during the previous semester project. Furthermore, a qualitative study was performed to evaluate the usefulness of the implemented proxemic dimensions, Location and Movement, through an in-situ field study at selected households. During this testing period, interviews were conducted and system data was logged, which formed the basis of an analysis regarding the utilization of proxemic interaction in a multi-room music system. As a result, we found indications implying that the implemented proxemic dimensions assisted the users in general tasks of managing their multi-room music systems and revealed a tendency to a decrease of direct interactions with the systems.