Historical clue formulations

• Singer Bobby with a brave-sounding last name — 2023-12-16
• Bobby who sang "Mack the Knife" — 2021-09-30
• 1950s-'60s singer Bobby — 2021-06-21
• Bobby in the Rock and Roll Hall of Fame — 2019-09-14
• Bobby who sang "Mack the Knife" — 2018-01-15
• "Mack the Knife" singer Bobby — 2017-02-20
• "If I Were a Carpenter" singer — 2014-12-05
• Bobby of 1950s-'60s pop — 2014-10-06
• "Beyond the Sea" singer — 2011-06-10
• "Dream Lover" singer, 1959 — 2008-09-18
• Subject of the 2004 biopic "Beyond the Sea" — 2007-03-06
• "18 Yellow Roses" singer, 1963 — 2006-11-10
• Bobby who sang "Beyond the Sea" — 2006-06-26
• "Splish Splash" singer, 1958 — 2005-05-31
• "Beyond the Sea" singer, 1960 — 2005-05-08
• "Beyond the Sea" singer, 1960 — 2004-08-04
• "Splish Splash" singer, 1958 — 2002-03-24
• "Queen of the Hop" hitmaker, 1958 — 2000-11-30
• "Splish Splash" singer, 1958 — 1999-04-10
• Best New Artist of 1959 — 1997-12-26
• "Mack the Knife" singer — 1997-01-12
• "Splish Splash" hitmaker of 1958 — 1995-06-04
• "Mack the Knife" singer — 1995-04-18
• "Dream Lover" singer — 1994-09-09