There is nothing wrong with Danny Boy. I love that song. I love Amazing Grace. It’s just that the song Herman Cain wasn’t Amazing Grace, but rather the title was correctly noted previously and the tune wasn’t the traditional tune for Amazing Grace (although the words really do fit the tune of the House of the Rising Sun even though it seems to me to be a bit incongruous when thusly applied). I haven’t tried but I don’t think the words of Amazing Grace would fit Danny Boy.
the House of the Rising Sun
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Psalm 23 can be sung to that tune..
however I prefer the old tune we used to sing when I was young..
Descants and all...