Historical clue formulations

• "___ Ballet" ("A Chorus Line" song) — 2012-11-11
• "Casey ___ Bat" — 2011-08-22
• "___ Zoo," 1967 hit — 2010-11-20
• ___ least — 2007-02-09
• ___ ready — 2006-01-13
• "Casey ___ Bat" — 2005-06-01
• ___ drop of a hat — 2005-02-08
• Quip, part 4 — 2004-08-15
• Words before ready or time — 2001-06-17
• ___ drop of a hat — 1999-07-05