Glenn Gould: On Improvisation. November 1966 radio programme

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As Ken Haslam explains, this is Gould's November 23, 1966 half hour documentary "On Improvisation" (elsewhere, but not in this broadcast at least, called "The Psychology of Improvisation") as re-broadcast in an Ideas series in 1968 as a contribution to a series on 'chance'. Despite its inclusion in a series on chance, and some remarks by Gould on that subject, "On Improvisation" is not to be confused with Anti-Alea, which was first broadcast the following week in the same series. Part of "On Improvisation" is carelessly transcribed and mis-dated by Tim Page in The Glenn Gould Reader, under the title "The Psychology of Improvisation", but of course without the musical examples included here:
6:26 Schoenberg Op.11
6:53 Cirencester School students improvising - Peter Maxwell Davies
11:00 Bach Musical Offering: First movement: Three voice Ricercare
12:31 Bach Musical Offering: Last movement: Six voice Fugue
14:15 Victor Borge joke about sequences in music
15:46 Bach Fugue from Toccata in E minor
16:43 Mozart Fantasia
19:33 Beethoven Sonata Op.31.2 Tempest
22:12 Bach Toccata recitative example
23:42 Strauss Violin Sonata Op.18
24:39 Strauss Ein Heldenleben
26:47 Lukas Foss' Improvisation Ensemble