I've just seen this sad news on AOL and, although I knew Jon was ill, couldn't believe my eyes and nearly choked.
Deep Purple combined Ritchie Blackmore's guitar with Jon Lord's keyboards to create a thick heavy sound, strongly influenced by the American band, Vanilla Fudge. The sparring between Ritchie's guitar and Jon's keyboards fitted well with the rhythm section of Paice & Glover and Ian Gillan's screaming vocals. Added to this was Blackmore's subtle rock 'n' roll riffs, an ear for a commercial hit and a succession of powerful in-your-face albums from In Rock to Machine Head . . . and beyond. For sheer fire power, Deep Purple matched Black Sabbath and Led Zeppelin (who influenced both) in producing a solid core of influential British heavy rock. Fireball was one of the first heavy rock singles I remember listening to on the radio as a child. I do not think it is an exaggeration to say that the riff-heavy Machine Head album, with Jon's adept playing on tracks like Lazy and Smoke On the Water, changed my life.
Jon also went on to work with Whitesnake, which he had inadvertently created, by recruiting a then unknown David Coverdale to the later soul/funk incarnation of Purple. He also made an interesting album with Tony Ashton, The Last of the Big Bands. In a relatively recent interview, on Deep Purple continuing with Don Airey, Jon said Ian Gillan thought he could go on for ever, while he (Lord) knew his limitations and thus quit while he was ahead. Soon after, it was announced that Jon was ill, but was battling his condition. He was clearly more ill than I realised.
RIP Jon Lord, heavy rock keyboard pioneer.