Their Greatest Songs. Deep Purple. The Stories Behind The Songs. The Waterboys. The key line of their signature song The Whole Of The Moon “floated into my mind as if by magic” says its writer Mike Scott. Kris Barras. The blues-rocker on getting heavier, top advice from Billy Gibbons, and being a “Poundshop version” of Richie Kotzen. Deep Purple. How Machine Head was a triumph snatched from the flames of disaster. Plus: band members and other rock stars talk about their favourite Purple patches throughout their career.