Slightly more accurate transcriptions of I Will Go have been posted here in the past; you can find them through the "Digitrad and Forum Search", which you will find on the main Forum page.  No chords, though.

Info on Clearence song 'Land Of MacLeod' Lyric posted one-and-a-half times, also original Gaelic text, Tha mo dhùil, Tha mo dhùil.

Lyr Req: The Land of MacLeod includes lyric.

They wore red coats rather than plaids because they were fighting in the army, not in any of the Jacobite revolts.  There is no reference to Clearances in the original song; Roddy MacMillan added the last verse himself to give it a new slant.