Thanks, Jeri!  AbcMus still complains, but it now plays a tune that I recognise; it's An Alarc'h alright.  Sophocleese mentions Ray Fisher as the original knitter of melody to song, and that sounds convincing to me, though credit has also been given variously to Alasdair Claire (sp?) and to John Greig.

To add to the collection, here is an extremely Scottish version that Jack Campin posted to one of the folkmusic ngs. a while back:

The corbie wi' his roupie throat ca'd frae the leafless tree,
"Come ow'r the loch! Come ow'r the loch! Come ow'r the loch tae me!"

The crow pit up her sooty heid, looked frae her nest whaur she lay,
And gied a fluff wi her rusty wings, and cried "Whaur tae, whaur tae?"

"To pyke a deid man lying there, ahint yon mickle stane".
"Is he fat, is he fat, is he fat, is he fat? If no we'll let him alane".

"He's frae merry England come to steal oor sheep and kill oor deer".
"I'll come, I'll come, for an Englishman is aye the best o' cheer".

"We'll breakfast on his bonnie breest and on his back we'll dine,
For the lave hae gane to their countrie and ne'er come back sin-syne".

He goes on to say:
From William Macmath's manuscripts; recorded from the lawyer John Christian in 1893 - he'd got it from his Dumfries family. Apparently it's in Whitelaw's "Book of Scottish Song", which I have no recollection of if I've ever seen it; Whitelaw thought Alexander "Jupiter" Carlyle (the more-or-less-atheist minister of Inveresk in Enlightenment times) wrote it.

X:1 T:The Corbie and the Crow S:Edinburgh University Library Mic.M.605 (William Macmath MSS) Z:Jack Campin, Valentines Day 2000 M:C L:1/4 K:F C|A>G Ac|A>G Ac|d>c cA |c2 z|| A|G>F GA|G>F GA|cf A>G|F3 |]

Bit of a puzzle how Houseman and The Week Before Easter got onto this thread while I was out at the pub...

Malcolm