Cloud Chamber is an artistic exploration of the question: Can a city be heard as a harmonic symphony? It presents recordings from their sound installation series in which cities were made to resonate, and includes excerpts from their latest collaboration presented at New York City’s performance space. The Kitchen, in March, 1997. For the “Cloud Chamber” event, the two sonic alchemists installed a laboratory for transforming the New York City landscape into real-time ambient music. The installation functioned as an instrument, an “industrial digeridu” that was played by the city’s roar. Random city sounds caused an overtone series to resonate sympathetically. The chaos of cars, planes, people, motors, and construction was reduced to the order of the Pythagorean harmonic series. Hidden melodies and harmonics were revealed.