Anthony Mills Back Porch Majority Barry McGuire Belafonte Folk Singers Bob Harter Brothers Four Burl Ives Chad Mitchell Trio DeCormier Singers Glenn Yarbrough Gordon Lightfoot Greg McDonald Gregorian Helmut Lotti Hugh Masekela Johnny Mann Singers José Neto Letta Mbulu The Limeliters The Merrymen Millard Thomas Group Milt Okun Mystic Spirits New Christy Minstrels Norman Luboff Choir Odetta Phoenix Singers Ray Boguslav Richard Bona Seafarers Chorus Sivuca Valentine Pringle Walter Raim The Wayfarers The Womenfolk