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.
Ignaz Pleyel Ignace Joseph Pleyel (] ; ] ; 18 June 1757 – 14 November 1831) was an Austrian-born French composer and piano builder of the Classical period.