I was just researching the round, ‘By the Waters of Babylon’ as I mentioned it in another blog, and I found the original music, written in 1786 possibly or possibly not by Philip Hayes.
It has crunchier harmonies than Don MacLean’s version, and a fourth line! Can’t wait to try it out.
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Conrad's Chords 
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I first heard this song on “Mad Men” & instantly fell in love with it. This style of music just hits home with me as no others do. Thank-you for sharing about it.