Historical clue formulations

• "More of the ___" (1967 #1 album) — 2020-09-06
• "The Girl I Knew Somewhere" group, with "the" — 2012-03-31
• #1 album for 13 weeks in 1966-67, with "The" — 2009-11-05
• 1967 pop sensation, with "the" — 2008-08-10
• Group that starred in the 1968 film "Head," with "the" — 2007-11-02
• "I'm a Believer" band, with "the" — 2001-12-31
• "Valleri" band, 1968 — 1995-01-05