"It is a boon traveling companion, without which I do not function, I cannot operate. It has been with me for 21 years."I just found a wonderful clip on YouTube, Glenn Gould talking about his chair with filmmaker Bruno Monsaingeon. I suspect that this conversation, like other Gould-Monsaingeon conversations, was scripted by Gould.
"Do you actually mean it's been as close a companion to you as Bach has been in your musical career?"
"Oh, much closer actually."
Glenn Gould talks about his chair (YouTube)
Glenn Gould's chair