I, too, agree with Paddymac. They pretty much set the trend for the genre. If I had to choose only one Irish group to listen to...it would be The Clancy Bros and Tommy Makem. However, I do think that there are better groups around now...for different types of Celtic/Irish. e.g. for Rebel songs I like the Wolfetones And for instrumentals, I like the Chieftains, Altan, Clannad, etc. And my favorite all around group at the present time is/are the Dublin City Ramblers. I started to say that the Clancys are the Kingston Trio of Irish music...but that might open up a can of worms!