If we may extend the original question to bands, I have found very few people in the UK who ever heard of Felpeyu, an Asturias celtic group. Magical stuff, buy their last album "Ya!" and you won't regret it, even if you don't like the genre. Famous at home as well as in places like Australia, but virtually unheard of here. Unfortunately last July two of their members (incl their frontman) were killed in a car accident, so "Ya!" may well be their last work... But it is definitely one of my desert island disks.