Bruce Springsteen is turning 70; rock’s gods are getting on. It’s not clear who’s there with electric guitars to replace them. Younger acts are failing to make hit singles. Veteran rock journalist Mark Coles believes rock music has lost its ability to surprise and innovate. Record label boss Vanessa Higgins describes how the writing of hit songs no longer favours the rock format. Music critic Michael Hann blames the high costs of making rock as part of the reason for its decline. But Chris Woltman, manager of the band Twenty One Pilots, believes bands have adapted rock for a new generation of fans and industry veteran Sat Bisla details how rock is making headway in non-traditional markets like India and Indonesia. With Neal Razzell.