The traditional music of America in collection is musically representative of pioneer settlements of the country from Mexico to Canada and from the Pacific to the Atlantic Ocean. To insure that each section of this vast country was musically represented naturally would require a systematic and thorough coverage by those persons who have made this work their primary concern for a good many years. A look at the map of these United States gives the observer an acute awareness of the stupendous undertaking for those who were first to begin their trek into the regions of the land where folk song abounds, into communities into which fast-moving civilization has been slow to penetrate. Early in their history these communities were isolated because of the hardships and dangers of travel. With the spread of civilization, however, the country was tamed and became more densely populated so that the growth of folk song and traditions within the social life of these isolated communities was a natural sequence.