Possible Clues:

• Not totally clean, the messy religious work
• Man crazy about the country song
• 'O Canada,' for Canada
• In Sudan, the military embrace this stirring song
• "O Canada," for one
• Japan's "Kimigayo," for one
• Ireland's "Amhrán na bhFiann," for one
• U.S. national song
• Song using a new, recurring melody for the most part
• Two articles on composer's third patriotic song