A completely distinctive culture? You wouldn't play jigs, reels, hornpipes etc then? The only really different tune I've heard of was the Strathspey, and I've a feeling that's from the Orkneys or somewhere anyway. Of course there are different cultures- (catch me eating deep fried mars bars for example), but they're seriously intertwined. You can't deny that. (And before someone says it, I know that the tunes mentioned above get played differently in different countries, but they're still the same sorts of tunes. Often even just the same tunes.)