When you click on that URL, you'll see a listing of these related threads to that song:
Related threads: {origins) Origins: Cotton-eyed Joe-true story/composite? (102) Cotton-eyed Joe (10) Help: Cotton Eye Joe History (8) Cotton Eyed Joe....what's it mean.... (8) (closed) Req. chords for Cotton Eyed Joe (5) Lyr/Chords Req: Cotton eyed Joe (31) Lyr/Chords Add: cotton eyed joe (2)
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These threads are also hyperlinks so you can click to them and Voila! you're there.
Note: When you put Cotton Eye Joe [without the "ed" ending] in the Search box, you'll only get 12 hits ["hits" =threads on Mudcat in which that song title is mentioned. Only one of them is a thread about that song.