Hmmm...questions like this and the one about "Ballade de Louis Riel" make me aware that the Canadian songbook section of my collection consists of about zero volumes. But a couple of ideas...

• it has been suggested that the Black Donnellys of Lucan Ontario were demonized and ultimately massacred largely because they were pugnacious Irish immigrants...lots of songs about them.
• look into the Ballygiblin riots, near Carleton Place Ontario in 1824--violent altercations between Scots and Irish immigrants. There's a folk music club in C.P called the Ballygiblin Music Society--I don't know of any songs about the riots, but there must be.
• a book called "Bytown" (I think--it's in the Perth Public Library) tells some of the colourful early history of Ottawa including a lot of detail about the relative situations of the different groups of settlers vis-a-vis the timber trade.
• also it's probably not an excessive generalization to say that the Rideau Canal was designed by Scots and dug by the Irish.

  good luck...

  Willie-O