The jazz legend Charlie Parker was born on Aug. 29, 1920 — a Sunday. The saxophonist Lester Young was born on Aug. 27, 1909, a Friday. The trumpeter Jabbo Smith died on Wednesday, Jan. 16, 1991.

These may seem like petty pieces of jazz trivia to some people, but they are nearly articles of faith to Phil Schaap, the loquaciously edifying elder statesman of WKCR-FM (89.9), the Columbia University radio station, who during his 42 years on the air has emerged as one of the planet’s more knowledgeable jazz historians…

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