The rhythmic chorus of the two novelty songs has a definite kind of similarity to that of 'come o'er the stream Charlle', but with their own added originality. Kenneth McKellar obviously took Matt McGinn's mid 1960's street song type parody, and did his own take.. but naughtily used the same tune almost without alteration. I say naughtily, unless someone can find that McGinn himself used an earlier note for note tune. McGinn was already dead by the time McKellar's song was written/recorded, and the 'Red Yo' Yo' was circulating as a kids' type song. So he may have chanced his arm. I should say that McKellar is the writer/originator of the Midges, not Andy Stewart.