John Frykman, a pipe organ tuner, designer and installer, was persistent, and he had perfect pitch.
Those abilities served him well when he kept the massive instruments humming all around the Upper Midwest.
Frykman, of Bloomington, who didn't play the organ, died Dec. 28 in Minneapolis. He was 83.
His daughter, Susan of Waterville, Minn., helped her father on his organ-tuning rounds in the 1970s.
"He'd occasionally use a tuning fork and then tune the other pipes to each other by ear," she said.
When he attended classical-music concerts with his daughter, he'd be quick to criticize anything out of tune.
"His ear was very attuned," she said. "He would sit there and wince."
He was the grandson of Nils Frykman, a founder of the Evangelical Covenant Church of America and composer of hymns. Frykman became fascinated by pipe organs while growing up.