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Q Ever since I heard that 4K could become a mainstream reality, I’ve held off on making Blu-ray purchases thinking that a new, better format is just around the corner. I’ve also read that certain TV shows going forward will be shot in 4K, which makes me wonder about the long-term fate of content that wasn’t recorded at that resolution.

There are blues legends and there are blues masters, and then there’s John Mayall. Long acknowledged as the father of the British blues scene that emerged in the heyday of the ’60s and the man who helped school the guitarslinging likes of Eric Clapton, Peter Green, Mick Taylor, Coco Montoya, and Buddy Whittington, the 80-year-old Mayall shows no sign of slowing down anytime soon. “You have no other choice, really,” he says matter-of-factly. “You set your feet on your path, and that’s what you stick with. It’s the only thing that you know to do.” His latest album, A Special Life (Forty Below), carries on the rich blues tradition, thanks in no small part to Mayall’s rapport with his band, led by a Texas-born guitar ace (Rocky Athas) and anchored by a Chicago-bred rhythm section (bassist Greg Rzab and drummer Jay Davenport). “Never plan to fade away,” Mayall sings in the title track. Dear John: We’re going to hold you to that.