irom wnat is toaay tne nottest corner of the musical world.* * *With Jack Linkletter, Art’s son, as emcee, the weekly banjo-twanging and toe-tapping starts Saturday, April 6, 8:30-9 p.m., EST.“Hootenanny” has an interest ing — it’s followers will please forgive the use of the word—twist.It will be produced in front ofa live audience of college students at various campuses around the country.George Washington University, Brown University, the University of Michigan, Penn State and Rutgers are early stops on the “Hootenanny” itinerary.* * *Originating on campus assures the show a very live live audience.For Betty Coed and her boy friend are said to have ignited the current folk music explosion that now reverberates on the best seller record album lists, and in night clubs, concert halls and coffee houses.About “Hootenanny” Jack says, “I’ve been learning about folk music and listening to it and I’ve found that the more you hear it the more you like it. It’s a very infectious thing. You soon begin to understand why it has become as popular as it has.”Jack admits he’s merely a good listener whose attempt at musicianship ceased after having taken piano lessons “once, for six weeks.”As a non-expert he’ll be able to identify with the home audience, be their man in Hootenannysville.And it shapes up as a good place to visit Saturday evenings.The series is being produced by Dick Lewine, who has turned outsuch fine television items as the New York Philharmonic YoungPeoples’ Concerts with LeonardBernstein, Rodgers and Hammer-stein’s “Cinderella,” and “TheNoel Coward-Marv Martin Show ”Lewine has credits also as a composer of music for the Broad-