Jon Lord means in slang: He is one of the most renowned Keyboardists alive. The pianist was classically trained and then moved to the Hammond Organ. From 1968 to 1976, he was the keyboardist. He also founded Deep purple between 1984 and 2002. His genius is responsible for the Hammond organ sound that makes purple possible. Highway star, Rat Bat Blue and Lazy are his best solos. These songs are worth a listen. Unfortunately, he died in 2012. R.I.P John Douglas Lord, lord of Hammond. (in Slang Dictionary, added by Kiana Woodward)