My own home county of Donegal produced some of Ireland's best fiddlers. Johnny Doherty, Neili Boyle, Francy Byrne, and John Gallagher (better known as John the Tea) to name a few.
When farmers brought their livestock to town for sale on Fairdays, John Gallagher's family made lunch for them so he became known as "John the Tea." John in his young days got another name to his credit when he went onto win the All Ireland Fiddling Championship.
Neili Boyle was the first fiddler I heard on an old 78 and even to this day his playing amazes me.
Johnny Doherty and Francy Byrne both possessed an endless repertoire of music.
Donegal had many other great fiddlers, too numerous to mention.