Iona's second CD, released in 1992, was titled The Book of Kells, a musical tour de force that that not only captures the artistic themes of the 1,200 year old illuminated manuscript by the same name but also some of the theological flavor of Celtic Christianity. Eighteen years later I still listen to it, listening to it as I wrote this post.
If you like listening to Celtic music, especially by musicians such as Enya and Clannad, I am almost certain you will like Iona. They will soon be touring the US and I hope they will appear in New York City.