Historical clue formulations

• Per the Beach Boys, they're the cutest in the world — 2015-08-19
• Hawaiian island dolls' superiors, in song — 2012-06-30
• Demographic lauded in a 1965 song — 2012-03-31
• 1965 Beach Boys hit — 2011-08-31
• They're the cutest in the world, per a hit song — 2011-02-12
• 1965 hit parodied by the Beatles' "Back in the U.S.S.R." — 2008-08-30
• Perennial 23-Across concert opener — 1998-10-15