Historical clue formulations

• "Hey, by the way …" — 2024-01-10
• Pregame song opener — 2014-05-28
• "Can you see" preceder — 2014-01-14
• Anthem's opener — 2011-07-05
• Key's opener? — 2011-04-07
• Key starter? — 2011-02-19
• Key opening? — 2009-04-12
• Anthem start — 2006-07-30