The site-specific performances of ‘Invisible Architecture’ take place in light-towers, art galleries, wastelands, churches, living rooms, and tunnels. Each site requires a new investigation, where the sound sources and the way in which the performance is developed, is chosen in relation to the acoustic response of the site.

‘Invisible Architecture’ is a research of Chrs Galarreta and Janneke van der Putten, highlighting acoustic phenomena hidden in a space. In the first version of this project, subtle acoustic phenomena of a light-tower were explored through its surrounding sounds and the acoustic reflections of the human voice. Resonant frequencies and reverberations were emphasized and prolonged with the interaction of the human voice and the echo, making recordings with unconventional microphone techniques. In the compositions and during the live performance, the intention was to make the acoustic reflections audible, more than the sound sources (the voice and surrounding sounds) that exited them. The tone modulations, breathing voice rhythm, and position and type of microphones used, were chosen in response to the qualities of the chosen site. From these variables drones, overtones and other acoustic phenomena appeared in the space.

This project was realized with an acoustic voice and a wire used as inter-communicator between the singer and the composer. Some works resulting from this experience have been published on vinyl and cassette.