“Glenn Gould’s Obsessive Quest for the Perfect Piano” is the subtitle of the book “A Romance on Three Legs”, reviewed on Sunday in the N.Y. Times. Gould’s perfect piano acquired a perfect tuner, Verne Edquist, who was somewhat forced into his career by the limited choice of vocations for someone with congenital cataracts. Edquist earned Gould’s respect by refusing to work on a piano that Edquist recommended instead be taken in for a full service. The piano tuner soon became responsible for keeping Steinway grand No. CD 318 in perfect shape.