Historical clue formulations

• Dancing duo of the early 1900s — 2023-06-30
• Old dancing duo — 2009-10-11
• Brother-and-sister dancing duo — 2009-08-27
• Dancing siblings — 2003-12-14
• Noted 1910's-20's Broadway duo — 1999-08-20
• Dancers Fred and Adele — 1997-01-06