Can anyone help me find words and/or music for a Scottish song called Dark Lochnagar, please? It may also show up as Lochnager or Loch na gCaor (the lake of the sheep).

It's popular among uilleann pipers as a "slow air" and has been passed on from one to another or learnt from other pipers' recordings in this form, but it seems to me that in the process the tune has got buried under too many layers of ornamentation, and I'd like to get back to the original in order to have a clearer idea of the appropriate phrasing.

I found a set of words through Mudcat at http://www.mudcat.org/@displaysong.cfm?SongID=3350, but they don't seem even remotely to fit the tune which I'm interested in.

I read on a sleeve note somewhere that the song I'm after relates to the Battle of Culloden, and that a set of words written by one of the English romantic poets (Byron?) used to be sung to it in the 19th century.