Historical clue formulations

• A Chorus Line — 2025-12-28
• "Fa la la la la, la la la la," e.g. — 2020-08-28
• "Fa la la la la la la la la," e.g. — 2008-05-03
• It may follow a bridge — 2006-04-22
• Chorus — 1998-04-08