Last month I spent a lot of time judging "Celtic" (sic) albums for an internet competition.
There was a very sizeable minority of the albums by bands entirely made up of Americans bearing the full, delightfully cosmopolitan range of Nordic, Latinate and Asian surnames that one finds in the USA, all thrashing away at the playlist so clearly pointed out in Eric Bogle's song. Sometimes there was a claim of Irish connections in earlier generations.
They were interchangeably bland, and the adjective "plastic" would be generous.
Irish artists, from the British Isles, had a far more eclectic approach- as I would expect from the excellent Irish musicians that I have met.
I don't remember anyone called Paddy though!
Cheers
Dave