The first shape-note tunebook published was "The Easy Instructor" in 1801. Although much of the music in various editions of "The Sacred Harp" is from eighteenth-century New England, to my knowledge, there were no New England shape-note books until the 20th century. Shape-note tunebooks were compiled, printed, and published in New York State, Pennsylvania, New Jersey, Ohio, Missouri, Wisconsin, Virginia, Tennessee, Kentucky, South Carolina, Mississippi, and Georgia prior to the Civil War. One Canadian tunebook was published in both shape-note and round-note editions. The music we think of today as "Sacred Harp" music was at one time widely distributed, whether in shape-note or round-note tunebooks. This is a somewhat long-winded response to Martha Henderson's comments.
As much as I appreciate Leonard Cohen's music, I can't think of any song of his that would lend itself to an idiomatic shape-note arrangement. I doubt Leonard Cohen will ever write a shape-note piece of his own. But the poem "A Villanelle for Our Times" by Cohen's mentor and friend F.R. Scott would lend itself to a New England style set piece.
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