I live on the American side of the pond and I don't find the sessions I go to Cheiftainated any more than they are influenced by the Boys of the Lough, Altan, Lughnasa, or any other group that is popular at the time. as for being corrected for a version of a tune, I have had native Irish speaking singers from Connemara tell me I was singing a song "incorrectly" or even better, that the song was not even traditional even though I had learned the songs from recordings of native speakers, usually from Irish National Archives. I am not talking about my grammar or pronounciation, criticism I would take gladly. The criticism usually originated from the the fact that the version I was singing was not the one they learned from their parents or at school. I actually found this to be a rather clever, win-win way of harvesting songs. The singers took me under their wing as a student. I added versions of songs to my repetoire that most of the musicians I knew didn't have in their collections.