Well, Seacht Suailci na Maighdine Muire (The Seven joys of Mary the Virgin-or something close in translation) is obviously an Irish Gaelic religious song. Two places I can think of off hand to look for it would be in Noirin Ni Riain's book Stór Amhrán which is available from Ossian. Publications of religous songs was not that common untill recently (at least in the Gaelic nations I am familiar with-partially because of the literacy aspect.) There is also a book by harpist Dennis Doyle called 'Songs of Celtic Spirituality' which might have it. Religous songs are tough to find. Sorry I couldn't be of any more help.