Two executives of the Columbia Broadcasting Company have gotten together to ask the musical question, ""What ever happened to radio?"" The rendition is stale. There's lots of memorabilia; a short, rather superficial, rundown on the genesis of federal regulation; some great moments recalled from early, middle and late public events coverage; commentary- evasive- on the changing patterns of sponsor control; and a qualitative analysis of The Second Mrs. Burton, Stella Dallas, and Young Dr. alone. Unfortunately the whole thing comes off like a sprightly lunch at wherever it is broadcasting executives currently gather to blame whatever it is broadcasting executives are currently blaming it on. And the cardinal sin committed is the gross mission of the most exciting development in radio today: FM broadcasting.