I made a mistake in my last post, referring to "Aeolian" when I meant "Ionian!" Thanks for being such a restrained bunch in not correcting me out loud! Anyway, in every regard except for that C natural, it's an Ionian mode tune (OK, so the tonic is D, not C, you purists!) and, after my decades of having to play it, it wasn't until I read this thread that I've heard it described as "sounding Scottish." Not to my ear it doesn't!