Question: Placide Cappeau was the author of "O Holy Night" which was set to music by what French composer and music critic
Sentence (from "Adolphe Adam"): A prolific composer of operas and ballets, he is best known today for his ballets "Giselle" (1841) and "Le corsaire" (1856, his last work), his operas "Le postillon de Lonjumeau" (1836), "Le toréador" (1849) and "Si j'étais roi" (1852)
Relevant evidence: No