This installation is part of a research investigation into the interactive potential of electromagnetic fields. Theremins – musical instruments played by placing one’s body within the electric field surrounding an antenna are used here to create a week long indeterminate sound recording. Three theremins are placed in an equilateral triangle inscribed in a circular drum. The tones emitted by the theremins are determined by the presence of visitors in the space, changes in electromagnetic activity, and other environmental factors such as temperature. Without human interaction the tones of each instrument drift slowly, sympathetically. The three theremins, initially tuned to the same note, will configure themselves into various consonances and dissonances throughout the run of the exhibition.