Think about that phrase, "If you listen to any of his better records, you get a sensation like watching a man compose a beautiful poem."
If you were to catch a man, a poet - Percy Shelley, say - in the act of writing, you would likely see a guy with a pen, perhaps not too comfortable with himself, shifting uneasily in his chair, maybe scratching where it itches, maybe crumpling sheets, maybe crossing things out, maybe in a concentrated sweat, occasionally committing a line or two to paper.
Which is to say, writing a "beautiful poem" is HARD WORK! Not a lot of fun to watch, and certainly not inspiring. I would describe the received sensation as something like dyspepsia.
So we're not talking about the resulting "beautiful poem," which could be inspiring indeed, but about a guy writing.
It's just as Mark Twain said: “The difference between the almost right word and the right word is really a large matter. ’tis the difference between the lightning bug and the lightning."