Who was responsible for "Hangman's Reel"? I hate that tune. One big, long, four-part chord progression with no actual melody.
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As far as playing tunes over and over for hours--we do that a lot to help those that don't know them, learn them. Also, I know a lot of old-time musicians who go into convulsions if you try to arrange a medley. More Europeanized "Contradance" musicians less so, but many American old-time musicians play only one tune for the whole dance.
"Old Joe Clark" (which is not Irish, so I won't blame it on them) is one of my all-time least favorite tunes, but I only disliked it until I had to play it for 30 minutes solid at a square dance. Put me right over the edge into outright hatred.