I've seen the odd copy of Fakesong online but it doesn't come cheap - £31-£244 accorduing to Boot Butler. Bob Pegg's Folk is worth a look, if you can a hold of it; as is his Rites & Riots which is one of the more sensible overviews of folk customs. Bob Trubshaw's Explore Folklore makes perfect sense until his chapter on folk music when this thesis goes of the rails somewhat.