Anonymous 09/24/2022 (Sat) 09:03 No.58 del
Monks on the isle of Iona and the Iona Abbey. I was thinking it might be gaelic but I could not find any chants similar on the tube. The book shown is the book of kells. The chanting goes on (with a few comments intermitten) until about 22:40.

Appreciate your help anon!