Placide Cappeau was the author of "O Holy Night" which was set to music by what French composer and music critic
Adolphe Adam Adolphe Charles Adam (] ; 24 July 1803 – 3 May 1856) was a French composer and music critic. 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)
Ignaz Pleyel Ignace Joseph Pleyel (] ; ] ; 18 June 1757 – 14 November 1831) was an Austrian-born French composer and piano builder of the Classical period.