Britney Spears  has called an impressive pop music summit by inviting Ke$ha  and Nicki Minaj  onto a remix of her latest "Femme Fatale" single, "Till the World Ends." The track leaked online late Friday (Apr. 22), before it was scheduled to be officially released next Monday, according to a countdown on all three pop singers' websites .
"Chimpanzees is hating, but I take it all in stride/Put her in a jungle with bananas on the side/Told you they'd revive your career, but somebody lied/I ain't talking poultry when I say this chicken's fried!" Minaj raps with a "Monster"-esque intensity to open the song. After Spears delivers the first verse, Minaj introduces Ke$ha, who sings the track's pre-chorus and mirrors Spears in other patches of the song. The final third of the song also features a nifty instrumental breakdown reminiscent of the dubstep interlude in "Femme Fatale's" first single, "Hold It Against Me."
Spears, Minaj and Ke$ha all teased the release of a remix to "Till the World Ends" -- currently at No. 9 on the Hot 100 -- in Twitter posts  Friday afternoon. Minaj has been tapped to open for Spears on her summer tour beginning June 17, while Ke$ha originally co-wrote "Till the World Ends" alongside Max Martin, Lukasz "Dr. Luke" Gottwald, and Alexander Kronlund.
The "Till the World Ends" remix follows Spears' guest spot on a "Rih-mix" to Rihanna's single "S&M" that was released last Monday (Apr. 11). The new version of "S&M" helped the track land atop the Hot 100 with a combined 293,000 downloads, according to Nielsen SoundScan.
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