For almost ten years, while most of commercial radio has been resolutely aiming at the lowest common denominator, unsponsored Invitation to Learning (Sun. noon, CBS) has been persistently and unashamedly highbrow. Radiomen called it "Columbia's Hour of Silence" because they were sure that no listeners could possibly want to hear about Plato's Republic or Boethius' Consolation of Philosophy. Even the CBS publicity department once recognized its lack of mass appeal by referring to it as "the 69th most popular program on CBS."
Closeted in an Igloo. Undismayed by such catcalls, Invitation this week...
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