Historical clue formulations

• "___ Boom-De-Ay" — 2017-04-02
• Lead-in to "boom-de-ay" — 2015-11-26
• "Boom" preceder — 2014-11-22
• "Boom" preceder, in song — 2008-12-23
• "Boom" preceder, in song — 1994-03-13