Possible Clues:

• English national anthem originally in French
• Northern air
• Calixa Lavallée's best-known tune
• Anthem with the line "The True North strong and free!"
• Anthem for "eh" sayers
• It's heard at some ball games
• Strains at SkyDome
• Song heard at the SkyDome
• Albertans' anthem
• It includes the line 'The True North strong and free!'