I thank all of you for your input and suggestions. I wasn't aware of many of these books, and didn't think that so much material existed. Also, the Basic Folk Library Permathread looks like it is a great resource.

Joe, the word "Songcatcher" which appears in two titles you mentioned sounded familiar to me so I searched Amazon.com for books with that word in the title and I think I've identified the book I had in mind. It was written by Mickey Hart (of the Grateful Dead) and K.M. Kostyal and is titled "Songcatchers: In Search of the World's Music." Can anyone recommend or comment on this book?