Here are two YT videos which might be interesting for friends of Gould and those who want to get to know his understanding of J. S. Bach's music:
This is a CBC TV production from the 60s in which Gould gives a short but precise introduction to Bach's music and his position as a composer who was
"misunderstood, but certainly not because he was years ahead of his time but generations behind it."
In this video, Gould gives an (rather monological :) ) interview to the well-known director Bruno Monsaingeon, who made also films with Menuhin etc . Their conversation's topic are Bach's fugues (but not only those from the "Kunst der Fuge", as the title might pretend). Gould briefly analyses and performes e.g. BWV 878 (E major) and BWV 891 (Bb minor).