Historical clue formulations

• Singer who was an original judge on "The Voice" — 2021-05-07
• Christina of pop — 2020-03-15
• Christina on Rolling Stone's list of "100 Greatest Singers of All Time" — 2019-07-04
• Singer Christina — 2014-05-04
• Singer of the 2002 #2 hit "Beautiful" — 2006-03-18
• Pop star who was a 1990's Mouseketeer — 2004-10-29
• Pop sensation Christina — 2000-11-24