While I am a great fan of Bayard's work, I used the website 'Fiddler's Companion' while looking for fiddle tunes that had been taken to the States by European/British/Irish musicians, some of which now form the basis for the new CD 'Oh, Listen Today... - The roots of American Old-Timey fiddle music' (Musical Traditions MTCD517). 'Fiddler's Companion' is a great place to seek out tune families and relationships.