Historical clue formulations

• Jazz singer Cleo — 2024-10-20
• Singer Cleo with Grammy nominations in jazz, pop and classical — 2023-10-14
• 1940s-'60s singer Frankie — 2019-12-30
• Frankie whose song "That Lucky Old Sun" topped the charts for eight weeks — 2015-08-21
• "Rawhide" singer Frankie — 2010-06-02
• Singer Frankie — 2009-01-14
• "Mule Train" singer, 1949 — 2007-11-20
• Frankie who sang "Mule Train" — 2007-05-21
• Frankie who sang "Moonlight Gambler" — 2005-05-05
• Frankie or Cleo — 2005-03-01
• "Mule Train" singer, 1949 — 2005-01-26
• "I Believe" singer, 1953 — 2004-12-26
• "Mule Train" singer, 1949 — 2004-06-20
• "Mule Train" singer, 1949 — 2004-01-18
• "Mule Train" singer, 1949 — 2003-08-29
• Singer Cleo or Frankie — 2003-08-06
• Cleo of jazz — 2003-05-16
• "That Lucky Old Sun" singer, 1949 — 2002-09-28
• "Mule Train" singer — 2000-09-27
• "I Believe" singer — 1999-12-24
• 66-Down singer Frankie — 1999-12-05
• Cleo of jazz — 1999-10-27
• Singer Cleo — 1999-05-29
• Cleo or Frankie — 1999-04-15
• Cleo of jazz — 1998-12-16
• "Rawhide" singer — 1998-09-23
• "Rawhide" singer — 1998-06-05
• Frankie who sang "Moonlight Gambler" — 1998-01-13
• Frankie or Cleo — 1997-01-08
• "Mule Train" singer — 1996-05-03
• Singer Frankie — 1994-04-20