First performance of O Canada at the Congrès national des Canadiens-Français. The song would later become the national anthem of Canada #OTD in 1880.
The song was originally commissioned by Lieutenant Governor of Quebec Théodore Robitaille for the 1880 Saint-Jean-Baptiste Day ceremony; Calixa Lavallée composed the music, after which words were written by the poet and judge Sir Adolphe-Basile Routhier. The original French lyrics were translated to English in 1906. via @Wikipedia