I've sometimes got an odd reaction to 18th century Scottish slow airs (which are pretty much my favourite kind of tune). People can find them so alien they don't recognize them as being Scottish at all, and think they have to come from Eastern Europe or the Orient.

Those tunes were perhaps never all that well established in tradition, but they did better than Carolan, and it's surprising they've slipped so far out of public consciousness. It's not that people don't like them when they hear them, they just don't know where to place them.