Pepper Keenan has looked back on the time he was given the keys to Malcolm Young’s legendary AC/DC rig – an experience he describes as “concussive”. I went to a show and, yes, I got to play Malcolm’s rig,” he remembers. It was one half of a streamlined guitar rig that was defined by its raw, sledgehammer-style rock tone. As for why Malcolm’s tone felt particularly intimidating, Keen continues, “Angus’ tone is kind of spongy. Malcolm’s tone is not.