Artists with No.1 hits in 3 consecutive decades

[upland1425]

According to the Chart Beat column of Billboard.com (February 11, 2011), here is a list of artists who've hit No.1 in 3 consecutive decades:

90's / 00's / 10's
Usher, Britney Spears
(The artists who have a chance to join this list are: Christina Aguilera, Mariah Carey, Destiny's Child, Diddy, Jay-Z and Jennifer Lopez)

80's / 90's / 00's
Janet Jackson, Madonna
(They have a chance to become the first artist to command the list in 4 decades.)

70's / 80's / 90's
Michael Jackson
* Elton John (including Dionne and Friends' hit in 80's)

60's / 70's / 80's
Stevie Wonder
* Paul McCartney, John Lennon and George Harrison (including the Beatles hits in 60's)
* Diana Ross (including the Supremes hits in 60's)

www.billboard.com/#/column/chartbeat/ask-billboard-britney-spears-3-decades-of-1005032752.story