Be Thou My Vision (Irish: Bí Thusa 'mo Shúile) is a traditional Christian hymn, which can be traced to Ireland but is now sung in English-speaking churches around the world.
See how it origons are traced back to Slane http://en.wikipedia.org/wiki/Be_Thou_My_Vision
The Johnstons
Paul Brady, Adrienne Johnston, Mick Moloney and Lucy Johnston