When I asked a couple of singers who play around the Chicago area if they used the accent, their reply was, "Well, after we heard an Irishman attempt to sing with an American accent, we decided that not using our own native, established accent maybe was a mistake." I've listened to the Gealic dialects and accents from recordings so much that I find it easier to use the Irish accent. I've asked people after a casual performance about my fake accent and they said they don't really notice any "fakeness." So it works for me.