This clip is absolutely sensational: as education, composition and in performance.
Glenn Gould was 28 years old here.
For the impatient, Gould's performance begins at 5:08, but I strongly encourage you to watch Leonard Bernstein's fascinating introduction.
This film originally aired in 1960 on CBS Television as part of its "Ford Presents" series.
The entire film in high quality (of which this clip is a small part) was painstakingly hunted down by YouTuber erp65 and his friends. It can be found here, and I urge you, I really DO urge you, to see it in its entirety:
I have sought erp65's permission to cross-post, as a courtesy, but I have not yet heard back. Meanwhile, my abject enthusiasm got the better of me.
This film has to be promulgated far and wide. This was erp65's entire intention here, and we owe him and his friends enormous thanks.
New York Philharmonic Orchestra
Conductor: Leonard Bernstein
Piano: Glenn Gould