The death of legendary Deep Purple keyboardist Jon Lord has shaken the rock world through some of its most celebrated musicians. Among those who have tweeted their condolences are Slash, Mike Portnoy, Iron Maiden, Tom Morello and many more. Perhaps the most notable post however, comes from Black Sabbath bassist Geezer Butler. In reaction to the death of Jon Lord, Geezer Butler shared his thoughts of the Deep Purple keyboardist.