John had consistently demonstrated prowess and consistancy well above that range, but he outdid himself on this occasion. The last note of the last show, a fairly long held-out note for emphasis at the show's end, John played (get ready...) a TRIPLE D! That's fully a ninth above the vaunted double C. Not only did he play it, and loudly, he held it out several seconds after the tape ended and the conductor cut us off. Normally, playing in that register has the possibility of cutting off the blood flow to the brain from the internal pressure require to achieve that, and players have been known to pass out from playing not even as high as a double C. So I turned around, fully expecting to see John falling off his chair from lack of oxygen. Instead, I was treated to the usual jovial John, his trumpet resting on his knee, and smiling like the cat who just ate the canary.
Around ten years later, John and I were touring together with Frank Sinatra. I asked John if he remembered that event, and he replied that of course he did. I asked him why he held the note as long as he did, and he replied, "It was the first one I ever played, and I didn't want to let it go."