I've had the experience of the Austria tune in chapel on Rememberance Sunday too. Very weird.

The political party of which I am a member held a competitive choral competition for local branches a few years back (for a bit of pre-election light entertainment) and our group sang Courage Brother. Brought the house down as the words were particularly apt for foot-weary campaigners (I think the Welsh words were a translation of the English)

And I always thought it odd that the Welsh version of Seven Drunken Nights is sung to a corruption of Baa Baa Black Sheep. Honest.

Sian