I have never heard a Def Leppard song and thought to myself that it could really use a Tom Morello solo, but maybe that means I just lack vision. On paper, the combination of Def Lep and Rage Against the Machine axe-wrecker Morello seems truly random. You could maybe argue that Leppard songs like “Rocket” foreshadowed RATM’s rap-rock hybrid, but that would probably be a stretch. One thing that Def Lep and Morello have in common, however, is a love of ’70s rock. You can hear that at work in their new song together.