'Elvis manages to pull off exponential, seismic shifts in energy, unleashing hoards of it through his voice whilst, within the space of a second, racing up the highest, most absolute vocal intensity; it's almost voyeuristic to see a single performer put so much energy; you look around to see if it's really possible; the voice just becomes a big tank panzering through the screen, punching in chorus after driving chorus and it is insanely, inexplicably thrilling seismic TV, bigger than the moon landing, a one-man volcano of energy; he makes it seem so damn effortless and, despite all the waiting and expected attention during the solo numbers, he always puts in an on-performance, the three unflagging takes of 'If I can Dream' all intense, committed; and he does this through vocal performance alone, not moves; this is probably one of the few times where the vocals mattered most to him, and it shows; after days of intense singing, he hardly even loses his voice; I challenge any current pop singer to match this three-day heavy intensity, this sheer rock and roll energy'

Elvis·Voice·Performance·Energy·Vocal power