Historical clue formulations

• Pop star who once stylized her name with a dollar sign — 2026-03-13
• Singer with the 2009 #1 hit "Tik Tok" — 2026-02-18
• "TiK ToK" creator — 2024-08-23
• Pop singer who used to use a dollar sign for the third letter of her name — 2020-10-06
• Singer with the 2009 #1 hit "TiK ToK" — 2019-09-08
• Singer who once spelled her name with a "$" — 2018-02-25
• Singer with the #1 hit "TiK ToK" — 2016-05-18
• One-named singer whose name used to be spelled with a dollar sign — 2015-10-06
• Singer with the 2009 hit "Tik Tok" — 2014-08-17
• Gaga contemporary — 2014-06-06