John, as far as I've heard from singers, a lot of material between folk singers is still passed on orally, during sessions or after gigs. Titles may get forgotten in the process, and a likely one made up by a singer when he or she starts doing the song. It can get really bad sometimes, not only with modern songs, even more so with trad. ones. But for us, there's always the Mudcat Café to turn to for help! :-)