Historical clue formulations

• Seminal protest song written at a Greenwich Village cafe — 2024-11-17
• Bob Dylan song that was a #2 hit for Peter, Paul & Mary — 2020-10-13
• Bob Dylan song ... or a hint to the object found by connecting the four circled letters in a diamond — 2011-03-09
• 1960s weather song by Peter, Paul and Mary — 2008-06-16
• 1963 Peter, Paul and Mary hit — 2002-03-04
• Folk standard — 1996-07-30