Composer Samuel Bordoli presents two 'Live Music Sculptures' in London, one at Monument, the other at Tower Bridge, as part of the City of London Music Festival. At Monument, visitors will experience an aural sense of ascension as they climb the attraction's 311 steps to a live musical accompaniment.
See also
http://www.timeout.com/london/museums-attractions/event/267766/samuel-bordoli-live-music-sculptures