HE great songwriter, pianist and producer Leon Russell changed the shape of popular music in 1970, when the Mad Dogs & Englishmen tour he devised for Joe Cocker provided the blueprint for Dylan’s Rolling Thunder Revue and Bruce Springsteen’s E Street Band. But as Russell acolyte Bruce Hornsby recounts, by 1993 – for many reasons, some of them self-inflicted – his career was becalmed. Hornsby visited Russell at his farm in Sideview, Tennessee, where he found two huge barns stuffed with detritus, including two or three buses in some disrepair, old mixing boards from the 1960s;
