Placide Cappeau was the author of "O Holy Night" which was set to music by what French composer and music critic
Placide Cappeau: Placide Cappeau (October 25, 1808 – August 8, 1877) was a French poet and the author of the well-known poem, "Minuit, chrétiens" ("O Holy Night") (1847), which was set to music by Adolphe Adam.
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