There is a so-called Donegal style of fiddling, though one also might plausibly identify several different, but related, styles within the county. To the extent to which there is one common style in the county, it is characterized by a rapid pace; a tendency to be more straight-ahead (unswung) in the playing of the fast dance tune types (reels and jigs); short (one-note-per-bowstroke), aggressive bowing; relatively sparse ornamentation; the use of bowed triplets more than rolls (an ornament like a turn) as ornaments; and the use of double stops and droning (playing on more than one string at once). None of these characteristics is universal, and there is some disagreement as to the extent to which there is a common style at all. But in general, aggressive and lively fiddling is very often heard in Donegal, which many listeners find exciting. Donegal styles have been influenced to a great extent by southern Irish styles as well as Scottish and Shetland Island styles and repertoire, and by the sounds, ornaments, and repertoire of the Highland bagpipes (the so-called Scottish warpipes). Another feature of Donegal fiddling that makes it distinctive among Irish musical traditions is the variety of rare tune types that are played. Highlands, a 4/4 type of tune based on Scottish strathspeys, which are also played in Donegal, are one of the most commonly played types of tune in the county. Other tune types common in the county, but relatively uncommon elsewhere, include barndances, also called "germans," and mazurkas.
There are, of course, a number of different strands to the history of FidDle playing in County Donegal. Perhaps the best-known and, in the last half of the twentieth century, the most influential has been that of the Doherty family. Hugh Doherty is the first known musician of this family. Born in 1790, he headed an unbroken tradition of fiddlers and pipers in the Doherty family until the death, in 1980, of perhaps the best-known Donegal fiddler, John Doherty. John, a travelling tinsmith, was known for his extremely precise and fast finger- and bow-work and vast repertoire, and is considered by many to be one of the greatest Irish fiddlers ever recorded. John's older brother, Mickey, was also recorded and, though Mickey was another of the great Irish fiddlers, his reputation has been overshadowed by John's. Other representatives, now dead, of older Donegal styles include Neillidh ("Neilly") Boyle, Francie Byrne, Con Cassidy, and Frank Cassidy. A great fiddler from Donegal who bears mention, but who did not play in a traditional Donegal style, was Hugh Gillespie. Some great Donegal fiddlers are still alive, including James Byrne, Vincent Campbell, John Gallagher, Paddy Glackin, Danny O'Donnell, and Tommy Peoples. Among the many younger players, the three fiddlers of the Donegal "supergroup" Altan, Maireád Ní Mhaonaigh, Paul O'Shaughnessy, and Ciarán Tourish, are commonly regarded as brilliant, as are Mick Brown, Martin Mcginley, Dermot Mclaughlin, and others too numerous to mention by name. Finally, although he is not known as a fiddle player, Dermot Byrne, the button accordion player currently with Altan, has a style and repertoire that is firmly within the Donegal instrumental tradition; he is widely regarded as one of the finest button accordion players in Ireland.