THE RUMOUR is a comic recitation or poem, not a song.

The page that Megan L linked contains a video performance by George Duffus that I was able to view and hear, but I am reluctant to try to transcribe it due to the dialect. I hope someone more familiar with Scots will try it.

THE RUMOUR is also on the following Andy Stewart albums (definitely not Andy M. Stewart):

Andy Stewart's Scotland

The Best of Andy Stewart (cassette).

Donald, Where's Yer Troosers?

Scotland: The Singers & the Songs