'How many Trad songs do the Mumfords do... ?'

I guess from that comment that you are thinking trad is a small subset in terms of audience numbers then PFR, I was thinking more in terms of number of songs and number of performers out there..... and also in terms of influence, after all, without the tradition, the style of music the Mumfords do would not exist!

So, what we now need is a definition of 'Small' ;)

John