Historical clue formulations

• "___ thousand flowers bloom" — 2014-01-21
• "___ thousand flowers bloom" — 2010-04-27
• "___ joy keep you": Sandburg — 1997-06-27
• "___ joy keep you" (start of a Sandburg poem) — 1997-05-04
• "I ___ Song Go Out of My Heart" — 1997-01-07
• "I___Song Go..." — 1996-07-07
• "_____ smile be..." — 1994-07-10
• "_____ smile be..." — 1994-05-05