Symphony in D major Opus 18 No.4 (3) Johann Christian Bach Download 'Symphony in D major Opus 18 No.4 (3)' on iTunes
Dan Jones and Luke Jerran's hot air balloon experiment takes to the capital's sky.
Playing a piece composed by Dan Jones, the 7 balloons play different parts of the piece.
The venture has already been a great success in Sydney.
The Sky Orchestra's arrival in London heralds a year to go before the 2012 Olympics begin.