Willows Song (along with Gently Johnny off the same soundtrack), was possibly the first 'folk song' I learned to sing a few months back.

Apart from the euphemistic line which goes:
'Our maid can milk a bull' - which puts me in mind of classic fertility cult imagery.

The most intesting line by far is the one which runs:
'Would you have a wondrous sight, The Midday Sun at Midnight.'

And while I know little enough about occult symbolism, I know the Midnight Sun, is an image used in certain circles.
Though what it means, I haven't a clue.

Irrespective of all that, can't see me wanting to sing Willows Song ever again, I've just heard it too many damned times!