I do so hate to be pedantic, but Commander Crabbe has got the punctuation badly wrong in his line from Raglan Road, notwithstanding the fact that most people mistakenly sing it the way he punctuated it.

It's not:

When the angel woos, the clay he'll lose, his wings at the dawn of day

It is:

When the angel woos the clay, he'll lose his wings at the dawn of day.