some interesting observations at minutes 15 to twenty;
also his observation of the how the early music was "possessed of that Infallible tonal homing instinct with which the young Mozart was so generously endowed"
which is what i think makes Django uniquely great; that same homing instinct
Glenn Gould - How Mozart Became a Bad Composer ("The Return of the Wizard") - YouTube
also, Gould is eccentrically entertaining always
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I once saw a documentary of Glenn Gould, and I could see that he had marked up his Bach score with the names of chords -- e.g. "Dm". Not sure how many other classical pianists, if any, do this!