ROCK AROUND THE CLOCK: A new decade brings a new No. 1 to the Billboard Hot 100, as rookie Ke$ha rises 2-1 with “TiK Tok.”

The 22-year-old, born Kesha Rose Sebert, is the first solo female to ascend to the summit with a maiden chart entry since Lady Gaga, who led with “Just Dance,” the first new No. 1 of 2009.

(Ke$ha is not credited on Flo Rida’s 2009 No. 1 “Right Round,” although she sang on the song’s chorus).

How many other women have conquered the Hot 100 on their first tries, as a lead artist, since 2000? Here is the list, which includes three “American Idol” champions and two artists who first rose to fame in superstar groups:

2010, Ke$ha, “TiK ToK”
2009, Lady Gaga, “Just Dance”
2008, Katy Perry, “I Kissed a Girl”
2008, Leona Lewis, “Bleeding Love”
2006, Fergie, “London Bridge”
2005, Carrie Underwood, “Inside Your Heaven”
2004, Ciara, “Goodies”
2004, Fantasia, “I Believe”
2003, Beyonce, “Crazy in Love”
2002, Kelly Clarkson, “A Moment Like This”
2002, Ashanti, “Foolish”
2001, Alicia Keys, “Fallin’ ”

DESIGN OF A DECADE, PT. 1: As this week’s charts are dated Jan. 2, 2010, “TiK ToK” earns the honor of first Hot 100 No. 1 of the new decade.

Here is a look at the first Hot 100 leader to ascend to No. 1 in each decade, dating to 1960. (The chart launched Aug. 4, 1958, led by Ricky Nelson’s “Poor Little Fool.”)

1960s: “El Paso,” Marty Robbins
1970s: “Raindrops Keep Fallin’ on My Head,” B.J. Thomas
1980s: “Please Don’t Go,” K.C. and the Sunshine Band
1990s: “How Am I Supposed to Live Without You,” Michael Bolton
2000s: “What a Girl Wants,” Christina Aguilera
2010s: “TiK ToK,” Ke$ha

(…)

Source: Billboard.com