Answer:Calixa Lavallée
Explanation:"O Canada" (French: Ô Canada) is the national anthem of Canada. 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.