Historical clue formulations

• Simon & Garfunkel song about emotional detachment — 2019-04-28
• Song that starts "A winter's day in a deep and dark December" — 2012-02-26
• 1966 hit from the album "Sounds of Silence" — 2009-02-06
• 1966 Simon & Garfunkel hit — 2000-10-06
• 1966 Simon and Garfunkel hit — 1999-01-11
• Top 10 song of 1966 — 1995-07-01