As the title of the "Got Back Tour" indicates, Paul McCartney is unabashedly embracing nostalgia on his latest North American trek, memorializing his late bandmates, reminicising about hearing Jimi Hendrix perform at a small London club and recounting how the Beatles desegregated a Jacksonville, Florida, venue in the 1960s.

But McCartney — who, even at 83, possesses the same boyish grin and boundless charm that made him the heartthrob of the Fab Four — is still a rock star determined to wow the crowds as he continues playing sold-out arenas. So, his wistful, captivating storytelling is accompanied by high-tech, eye-popping — and occasionally ear-blasting — production values, from a digital blackbird escaping from the stage-turned-cage to literal indoor fireworks bursting above t

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