They say the first Irish came from around there anyway.
It's good music anyway. The last Fleadh Ceoil I got to, a couple of Gallego lads turned up on the street with their bagpipes, and they went down a storm.
There's a great record the Chieftains put out, playing Galician music. (But then there's a great Chieftais recorde of Chinese Music as well. Whether you call it Celtic or not, it's a state of mind, nothing to to with race and all that stuff.)