I must say that there are surprisingly few tunes in this book which are Welsh-and-nothing-but-Welsh. However, Cass does discuss this in the Intro which is very interesting. It's quite a reflection on the skill and knowledge-base of jobbing fiddlers of the day and also, perhaps, their attitude to tunes associated with the fore-runner of the fiddle: the crwth.

Hopefully some 'Catter will take a look and report back!

sian