l-man, please try to post in an existing thread on your subject. It's not a good idea to start a new thread for every post. If the subject isn't on today's menu, use the filter to find old threads with that name - you can put "roddy" in the filter box and set the age back, and it fill pull up all the Roddy threads right away.
The tune I know for MacPherson's Lament/Farewell is this one (click), although I think I've heard variations. The tune I know for "roddy" is this one, although again I admit that there could be others. I guess I do hear similarities in the two tunes, but they're certainly not the same.