Historical clue formulations

• "America the Beautiful" has four of them — 2025-06-27
• Pieces of poetry — 2023-06-15
• They make up poetry — 2015-01-09
• Round parts, perhaps — 2008-12-26
• Parts of numbers — 2004-09-10
• Song parts — 2000-11-05
• Singing parts — 1999-04-18
• Ballade's trio — 1999-03-26
• Canzone parts — 1997-08-30