Vocal ensemble I Fagiolini sing in St Bartholomew the Great church as Bridie Hooper of Circa performs 'Stirrups' on a highwire, June 25, 2013 in London. Showing as part of the City of London Festival in which audiences will see and participate in music, dance, art, film and poetry performances in some of London's iconic spaces and venues. Peter Macdiarmid/Getty Images