Historical clue formulations

• Tegan and Sara, e.g. — 2024-08-14
• Sonny and Cher, e.g. — 2022-06-16
• The Chainsmokers or Eurythmics — 2018-10-21
• Hall & Oates, e.g. — 2010-10-24
• The Carpenters, e.g. — 2009-12-05