To Explain the theme, here's a band from Belfast. The song is RnB, but the band is Irish.
We also have Thin Lizzy from Dublin, the main guy from the Waterboys is from Scotland (close enough) and the best album was after they moved to Dublin.
The Others are pretty self explanatory
The Pogues are London Irish (which means they are happy to live up Irish stereotypes, I was told.) The Dropkick Muphys are just Pogues fanatics from Boston.
Sinead. What more needs to be said?