Historical clue formulations

• "Buona ___" (parting phrase in Italy) — 2015-06-18
• Dark time in Italy — 2007-07-29
• Verdi aria "Tacea la ___ placida" — 2002-06-06
• Night, in Napoli — 1999-09-09
• Napoli night — 1994-05-20
• Night, in Napoli — 1993-12-23