Historical clue formulations

• "U Can't Touch This" rapper — 2018-03-14
• Thor's favorite rapper? — 2017-10-08
• "Let's Get It Started" rapper — 2015-11-22
• *Baggy pants popularizer in the 1980s — 2012-04-25
• Stage name of entertainer Stanley Burrell — 2011-07-02
• "U Can't Touch This" singer, 1990 — 1998-11-04