Carrie Underwood: The Billboard Cover Story
Carrie Underwood on the cover of Billboard, issue date Oct. 24, 2009. Matthew Rolston

'IT'S' NO. 1: Carrie Underwood collects her 10th No. 1 on Country Songs, as "Undo It" lifts 2-1. The song is the third leader from Underwood's "Play On" album, following "Cowboy Casanova" and "Temporary Home."

Underwood plated three Country Songs No. 1s from her debut set, "Some Hearts," in 2006-07 and four from "Carnival Ride" in 2007-08. In addition to her 10 toppers, Underwood's two other singles promoted to country radio - "Don't Forget to Remember Me" and "I Told You So," the latter featuring Randy Travis - each peaked at No. 2.

With 10 No. 1s on Country Songs, Underwood ties Reba McEntire for most chart champions among women since the survey converted to Nielsen BDS-monitored airplay data as of Jan. 20, 1990. Here is a look at the solo female artists with the most leaders in that span:

10, Reba McEntire
10, Carrie Underwood

9, Faith Hill
7, Shania Twain
6, Jo Dee Messina
5, Martina McBride
5, Trisha Yearwood
4, Sara Evans
4, Patty Loveless
4, Taylor Swift
4, Wynonna

Among all artists since Jan. 20, 1990, McEntire and Underwood (and Rascal Flatts) trail nine solo males and one duo for most Country Songs No. 1s. Here are all the acts to total double-digit leading titles in the chart's BDS-monitored era:

26, George Strait
25, Alan Jackson
23, Tim McGraw
20, Brooks & Dunn
19, Toby Keith
18, Garth Brooks
17, Kenny Chesney
15, Brad Paisley
11, Clint Black
11, Keith Urban
10, Reba McEntire
10, Rascal Flatts
10, Carrie Underwood

APPROVED 'DRUG': Ke$ha banks her first No. 1 on Dance/Club Play Songs, as "Your Love Is My Drug" rises 3-1.

The singer previously reached No. 11 on the list with her maiden entry "TiK ToK" and No. 37 with "Blah Blah Blah," featuring 3OH!3.

"Your Love Is My Drug" is the third song this year to crown Dance/Club Play Songs and Mainstream Top 40 (where it reigned for two weeks in June). Lady Gaga's "Telephone," featuring Beyonce, ascended to No. 1 in February and Rihanna's "Rude Boy" reached the summit in May.

Six songs topped both lists in 2009 after just one title - Rihanna's "Disturbia" - led Dance/Club Play Songs and Mainstream Top 40 in 2008. The elevated total of shared No. 1s in 2009-10 thus suggests a surge in popularity for dance music on pop radio.

Who may deserve the highest share of praise for the dance genre's increased profile on mainstream top 40 airwaves? Of the nine No. 1s on both charts since last year, five belong to Lady Gaga.

ALL THAT JAZZ: Pop veterans storm the Jazz Songs chart this week.

Rod Stewart and guest Stevie Wonder make their first visits to the list on a cover of the latter's "My Cherie Amour" at No. 28.

One rung lower, Herbie Hancock's update of John Lennon's "Imagine" grants Pink her first entry on the chart. Fellow featured acts on the song include Jeff Beck, India.Arie and Seal.