Only the first title should be converted to from sort to display order. Subtitles don't influence display order, so don't need to be touched. OK, I now have a subtitle with a comma ('Ring the Bell, Watchman'). If it was the main title I'd have to do something else, but it isn't, so for now...

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−This book is for tunes that are not part of the regular
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−Havoc session or dance repertoire.
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−Typically these tunes have either fallen out of popularity at sessions,
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−or are simply tunes that I like.