Historical clue formulations

• Songstress Eydie — 2015-08-16
• "I have no idea!" — 2014-09-11
• Singer Eydie — 2013-02-06
• 1966 Grammy winner for "If He Walked Into My Life" — 2008-03-01
• "Eydie Swings the Blues" singer — 2007-11-25
• "Blame It on the Bossa Nova" singer, 1963 — 2007-01-14
• Early "Tonight Show" regular — 1994-04-09