Whittling what has been a frankly exceptional year in Irish music down to a square 100 tracks was never going to be easy. It never is, after all. We say it every year and yet it genuinely bears repeating: the last 12 months have been something else. In fact, don’t be surprised if we roll out a Top 200 next year. Of course, end-of-year lists like these might well seem inherently arbitrary on the surface (it is, after all, not a competition) but scrolling through – seeing the sheer variety and scope and intent and vision of acts from all across the…