Historical clue formulations

• Doo-___ — 2017-05-28
• Doo-___ music — 2010-05-11
• "Doo ___ (That Thing)" (#1 hit for Lauryn Hill) — 2010-04-30
• Doo-___ — 2010-02-24
• Doo-___ — 2009-04-29
• Doo-___ — 2005-06-22
• Doo-___ — 2003-02-02
• Doo-___ — 2001-04-22