Banish Misfortune
A mixolydian jig. That flattened seventh gives it an open, unhurried quality. It mostly sits in D major but the C natural keeps pulling it somewhere older.
This is the version I learned, a fairly standard setting with three parts of eight bars each.
The melody sits comfortably on fiddle, flute, or whistle. The Mixolydian mode (D scale with C natural rather than C sharp) gives it that characteristic neither-major-nor-minor quality that turns up often in older Irish tunes.