I had a story relayed to me about the great Herbert L. Clark in which a man approached him and asked him to simply play one note.
This was approximately in 1932 or so, and Herbert L Clark reportedly had not played for ten years at that point. He told the man he hadn't played in ten years, but the man persisted and asked and bugged him so much, even saying "just play one note, so I can say I heard you play". So, the story goes that the great Herbert L Clark took a mouthpiece out of his pocket and held the cornet with his left hand and proceeded to play every chromatic note from a low G below the staff to a G above the staff, 2 octaves without using a single valve.
Now what I am asking is this: can this possibly be done, taking into account who was doing the playing, and all the other factors? Or, the question is, could anyone possibly do this? I asked a few people already from TM and this is not me doubting their answers, it is just a desire to get more opinions on it. I neither believe it or doubt it, I would need to see someone do it. 2nd and 3rd hand stories are weak at best.
And the question we must all ask is this: why would he have a mouthpiece in his pocket if he hadn't played in ten years?