Referring to the Etna Carbery poem/song, Joe (Offer) mentions in a recent thread now recycled to here, that "the tune is Sean South of Garryowen". This is true - but Roddy predates Sean! O'Lochlainn, in his More Irish Street Ballads book says that he doesn't know the origin of the "stirring march tune used" (or words to that effect.

Regards