Re: "Dawns Flodau Nantgarw".

I can only refer one to a vinyl record that I have of Welsh Folk Dance music. It is played by a band of musicians under the leadership of Pat Shaw who collected most of the tunes (from where I know not?)

As I said the track on this record which refers to the tune "Nos Galan" is entitled "Dawns Flodau Nantgarw. Another Welsh folk group at the time was Pedwar Yn Y Bar who featured this tune on their recording, but under the title of "Nos Galan".

Maybe one can find an answer at The Welsh Folk Museum, at St Fagins in Cardiff?

Nantgarw is a village North of Cardiff.