For the third time in four weeks, the lead for the most No. 1s in the history of Billboard's Pop Songs chart changes hands, as Rihanna 's "S&M" rises 2-1 to become her record eighth topper on the tally - while a new remix of the track featuring special guest star Britney Spears  has been made available as of today.
The three-way deadlock between the female superstars didn't last long. Lady Gaga notched her seventh No. 1, "Born This Way," two weeks ago. That track had displaced P!nk's "F**kin' Perfect," which had reigned the prior two weeks.
(Rihanna also fell just shy of the summit with three titles that peaked at No. 2: her debut chart entry "Pon De Replay" in 2005; "Unfaithful" in 2006; and, "Umbrella, featuring Jay-Z , in 2007).
"S&M" propels Rihanna to the honor of most Pop Songs No. 1s after the song had already granted her the mark for most top 10s four weeks ago. The track is her 18th Pop Songs top 10; Mariah Carey  ranks second with 17.
Here is a recap of Rihanna's unprecedented eight Pop Songs chart champions:
Year, Title, Weeks at No. 1
2006, "SOS" (one)
2008, "Take a Bow" (three)
2008, "Disturbia" (three)
2008, "Live Your Life" (two) (T.I.  featuring Rihanna)
2010, "Rude Boy" (two)
2010, "Love the Way You Lie" (two) (Eminem  featuring Rihanna)
2010, "Only Girl (In the World)" (three)
2011, "S&M" (one, to-date)
As previously reported , "S&M" last week became Rihanna's record-setting fifth consecutive No. 1 on the all-format Radio Songs chart, besting streaks of four each by Destiny's Child  (2000-01) and Usher  (2004).
Surely helping the song's future chart fortunes, Island Def Jam has serviced radio and iTunes with a remix  (or, "Rih-mix," as the label has dubbed it) of "S&M" featuring Britney Spears singing a verse and adding other vocals. "Elvis Duran and the Morning Show" premiered the new version of the song just after 6 o'clock this morning on WHTZ (Z100)/New York.
All charts, including the Billboard Hot 100, where "S&M" has bulleted the last two weeks at No. 2 below Katy Perry 's "E.T.," featuring Kanye West , will be refreshed Thursday (April 14) on Billboard.com.
- Chart Beat