"I know Rod Stewart recorded it."
The McPeake's took Stewart to court and lost the case because it was proved that it was a traditional song; the 'Braes of Balquidder'
Francie McPeake was still bitter about it when he spoke at the Willie Clancy Summer School a few years ago.

I believe the first court case involving the ownership of a traditional song was over the claimed composition of 'The Wreck of the Old '97'
Jim