The Lament Mary MacLeod (Cumha Mairi Nighean Alasdair Ruadh) 

The great lament composed for the Harris bard and poetess Mary MacLeod by Patrick Og MacCrimmon. She was born at Rowdel, Harris, in 1567 and died aged 105 years in Dunvegan in 1674. Mary Macleod is widely regarded as one of the main writers of the new school of poetry that was emerging in the 17th century, which eventually replaced the classical Gaelic bards. Curiously, she was buried face down in her native Harris, a practice sometimes reserved for people of some promiscuity - it is rumoured that she had romantic liasons with Patrick Og.
The setting I play is one with the High G's replaced by High A's throughout the tune. In my opinion, and that of some others, the High G note is without context and indeed completely out of key within the structure of the tune.