Our challenge was to create a musical piece from non-musical sounds, in this case a multitude of knockers, buzzers and doorbells. We did this by individually tuning each sound to a set pitch so that we could accurately recreate the melody of ‘Also Sprach Zarathustra’ by Richard Strauss.. This created another hurdle in that changing a pitch also changes the speed of a sound, therefore each one had to be stretched or compressed to fit the rhythm of the piece. We wanted to place listeners outside real doors all over the country, so we used different street atmospheres for each different bell ring or knock; when we wanted a Victorian or Edwardian house bell for example, we used the atmosphere from a real street with that type of architecture. The end result is a Symphony of bells building to a massive crescendo and an exciting final climax.