Don't know where you are from Bernie60, but it will likely affect the type of 'Irish' music you are hearing. Irish music is broad and differant as music anywhere else in the world. U2, Boomtown Rats, Thin Lizzy, Christy Moore, Dubliners, Devine Comedy, the Pouges not to mention all the trad stuff. So it's down to you hearing a song you like and learning it, like any song from anywhere elese in the world. Also some of the best loved 'Irish' songs aren't Irish at....Nancy Spain and Black is the Colour are both Scottish. Long way to Tipperary is English. Galway Girl is american I believe.
Wexford,
Ireland
My ambition far exceeds my ability