How strong is your Deep Purple lust? Do you want to venture out and gaze upon gray, wrinkly Brits (and relatively youngish American guitarist Steve Morse) burning through a grip of songs they’ve been playing for 40 years or longer? Well, when they’re some of the most exhilarating, ’ard, and ’eavy rock tunes ever to blow back your muttonchops, you probably can overlook the potential motions-going-through display and revel in the familiar heroics. Bassist Roger Glover, drummer Ian Paice, and vocalist Ian Gillan are still jamming from the classic ’70s days, when Deep Purple were flamboyant rock gods among mortals and tracks like “Fireball,” “Burn,” “Space Truckin’,” “Speed King,” and that one song every beginning guitarist by law has to play inspired wild-eyed devotion. It’s also cool as hell that they still do “Hush.” by Dave Segal