"Although she had piano and violin lessons at school, Bush is essentially self-taught. I have always been fascinated by the difference of dynamics at work between popular artists and conventionally trained classical musicians, and had a similar experience with the Edge, of U2, when we worked together on the score of a film called Captive. In fact, gifted "pop" musicians like Bush and U2 are far more demanding of themselves in the studio than classical musicians can afford to be, and will spend days working on a tiny fragment."