Susan Christie was a Philadelphia-based folksinger and a one-time member of the Highlanders, that city's top "big-band" folk ensemble of the early '60s. She attended the Berklee College of Music in Boston, and took easily to the new requirements of the booming folk-rock field in the mid-'60s. She was cheerful and sufficiently accessible as a singer to lend her voice to the song "I Love Onions" (popularized on the Captain Kangaroo show) in 1966. That was enough to get her a chance to cut a brace of demos during the years 1966-1968, comprised of exquisitely beautiful examples of...