Guitar and bouzouki player Dónal Lunny is one of the pioneers of the Irish folk music revival. His first group, he told me, "was a very close imitation of The Clancy Brothers, used to go to sessions every weekend in a pub called Pat Downing's in Prosperous, where there were some traditional musicians. As there was no other accompanist, I had sort of carte blanche with my guitar. So I used to go there and play all night, play tunes, reels, and jigs, and whatever on my guitar. I'm sure I was dreadful at the beginning. It improved as time went on, and I got involved in different...