From those big “wall of sound” numbers with the Walker Brothers, to the baroque pop of solo albums Scott 1-4, and his latter day rebirth as shadowy leader of the alt-rock avant garde, few careers have followed more fascinating trajectories than Scott Walker’s. And despite now pushing 70, with his 14th studio album, he continues to push boundaries. Bish Bosch confirms what his previous two albums have implied: that Walker is now more fascinated by sound design than traditional song craft, and finds him creating unsettling rhythm tracks by scraping machete blades together, and conjuring a sense of claustrophobia by rolling marbles around a dustbin lid. It doesn’t always make for easy listening, but if you persevere the rewards are manifold.