Via Billboard: Quirkiest-seeming charts of all time have to be the Mainstream Top 40 song chart for 1992-2012 and its corresponding ranking of the top Mainstream Top 40 artists of the past 20 years. Apparently, the ranking is weighted in order to "ensure equitable representation," but some things that jump right out as mind-blowing:
Rihanna—the #1 artist of the past 20 years in this field—has no songs in the Top 10, and Kelly Clarkson is the only solo female with a song in the Top 10 ("Since U Been Gone").
In spite of Clarkson being the only female with a song in the Top 10, the Top 40 artists of the era are headed up by an entirely female Top 6
Madonna is at #10 in spite of radio's chilly feelings toward her during that era (notable exceptions including "Take a Bow" and "Music")
Janet Jackson is higher than Madonna
Lady Gaga, with only a few years under her belt, is just outside the Top 10
Pink is the #2 artist for this era
Britney Spears is #3 with only one song in the Top 40
I used to be obsessed with charts. I guess by "used to be" I mean "still am" whenever the opportunity arises!