Historical clue formulations

• Singer with the 1984 #1 hit "Caribbean Queen" — 2020-05-26
• Aquaman's favorite singer? — 2017-10-08
• Singer with the 1984 hit "Caribbean Queen" — 2007-04-04
• "Suddenly" singer, 1985 — 1998-06-27
• "Loverboy" singer, 1984 — 1997-12-25
• "Caribbean Queen" singer — 1995-02-23