In this film, Katy Woolley introduces her instrument - the horn. To learn more about the horn visit http://www.philharmonia.co.uk/explore/instruments/horn Why not download our iPad app The Orchestra to learn even more? Visit www.philharmonia.co.uk/app for more information. "Have you seen the app called 'The Orchestra'? It is astonishing. For somebody who can't read music to learn how an orchestra functions, to be able to see from the perspective of a flute or a second violin, is really enl