I FOUND IT!!!! A mere 10 years after I began this thread, I watched Folk Sound USA at the Paley Media Center in New York (formerly the Museum of Broadcasting, formerly the Museum of TV and Radio). Art, it is exactly as we remembered it. The show aired in June, 1960, on CBS, sponsored by Revlon (the commercials are included). The choral version of Walt Whitman's "I Hear America Singing" is godawful; I believe it was composed by a random note generator. The rest of the show is quite wonderful. It was the first time I ever heard bluegrass and I immediately fell in love. A year later I got my first guitar.