Circumstance - 'Of Sleeping Birds'

I recently played for Circumstance's new location based sound piece,' of Sleeping Birds'.  Super interesting project.  A sound track was pre recorded and then 'mapped' to the centre of Cambridge.  Sarah Anderson and Duncan Speakman (the brains behind the project) created 40 beautiful hand made speaker boxes which housed a speaker and a GPS enabled android phone. Four groups of ten members of the public then followed a guide on a specified route around cambridge.  The effect was really quite magical.  Sarah had done some very odd stuff to my tenor sax parts and her duvet solo and we got to experience the finished work in all it's glory.