By way of Hacker News, I found this obituary for Verne Edquist on the Glenn Gould Foundation website.
Mr. Edquist was born with congenital cataracts and was nearly blind. He trained as a professional piano tuner.
He moved around a lot, sometimes working for piano makers, sometimes working as a freelance tuner.
One afternoon about a year after Verne started at Eaton’s, Miss Mussen sent him across town to Glenn Gould’s apartment to tune Gould’s old Chickering. All Gould wanted, he told Verne, was for the tuner to do what had been done hundreds of times before: get the piano into playable condition, if only for the time being. But Verne refused, telling Gould that the tuning pins were so loose they needed to be replaced.
Verne’s stubborn insistence on doing things his way had endeared him to Gould, and the encounter galvanized what was to become a decades-long association between a pianist and his technician.
Verne tuned for many famous musicians over the years, including Duke Ellington, Arthur Rubinstein, Rudolf Serkin, Victor Borge, and Liberace. But it was the business he got from Gould that eventually enabled him to quit Eaton’s employ and sustain his family for two decades.
Each tolerated the other’s idiosyncracies, which were in ample evidence in both men. Gould’s quirks, of course, were legion and legendary. One of their earliest conversations was about Verne’s physical limitations. “I can’t see very well, but I get the job done,” Verne told Gould. And Gould replied that of this he had no doubt. Nothing further on the topic was ever said.
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I’m not a musician, or a piano tuner, but that Katie Hafner book (affiliate link) sounds fascinating to me for some reason.