Possible Clues:

• "Cantique de Noël," in the States
• Christmas song in which "the weary world rejoices"
• Words before 'the stars are brightly shining,' in a carol
• Christmas song containing "a thrill of hope"
• Christmas song containing 'a thrill of hope'
• "Fall on your knees" carol
• Carol with the words 'hear the angel voices'