Does anyone remember a regular (possibly weekly) music show on PBS, circa late sixties, early seventies, hosted by Pete Seeger? Guests included Elizabeth Cotton and the Beers Family. Also a show I believe was called "Live at Wolf Trap," same era? Any idea if these shows are available on video? I also recall a PBS show from that time period featuring Bascom Lamar Lunsford. "American Roots" music, indeed.