With his jangly guitar and unique way of playing it, Johnny Marr created the sound of The Smiths. He made the music to Morrissey’s lyrics in a band that defined indie music in the 80s. Since their split, Marr worked with giants from Paul McCartney to Noel Gallagher. But now he’s a solo act releasing his third album tomorrow, with a world tour to match. His old songwriting partner Morrissey has, by contrast, horrified his fans recently with apparently anti-Muslim comments and backing for the new right wing For Britain party. Krishnan has been talking to Johnny Marr about music, politics and Morrissey.