In Bronson's great work 'The Traditional Tunes of the Child Ballads', he found that 'Barbara Allan' was the ballad with the greatest number of tunes -- but I have a wee notion that many of them are close, based on no evidence other than my own ear and the several times that I've heard a version from a distance so that I couldn't detect the words; the giveaway is always the phrasing of the final line with the words 'hard-hearted Barbara Allan'.

If you can find it, a great example is Dolly Parton's version -- starts with someone else singing a verse a cappella in Irish Gaelic and segues into Dolly singing a full, traditional American version with accompaniment.

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https://www.youtube.com/watch?v=087p-Wpkyog