Possible Clues:

• Spot the first piece of music
• The French have a word for it in church, and it's in Latin
• Met about to turn up in choral fashion
• Choral piece taking little time before New Year celebrations
• It's sung a second before New Year in Vietnam
• Piece by Palestrina
• Church song
• Gathered round books of music for voices
• Word; fixed period
• Piece for choir presenting test - and not in English