Help finding a Glenn Gould recording

[Fadi -]

I am hoping you can help me out with a search I have been trying to do. At the very end of the “Genius Within” and also at the very beginning of the following track (www.youtube.com/watch?v=iET5Azm8nKE&t=48s), there is a piece played by a quartet followed by Glenn playing. I am trying to identify which piece it is and which album I can find the full recording.

If you would be kind to help me out, I would greatly appreciate it.

Thanks in advance
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