United We Stand: Best USUK Collaborations in Music

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  • T.I., Jay Z, Kanye West, Lil Wayne, M.I.A.
  • Philip Bailey, Phil Collins
  • Michael Jackson, Marsha Ambrosius
  • Nas, Amy Winehouse
  • Common and Joss Stone
  • Floetry, Common
  • Taio Cruz, Ludacris
  • Wiz Khalifa, Tinie Tempah
  • Whitney Houston, George Michael
  • Kanye West, Amy Winehouse, Michael Jackson
  • Eminem, Dido
  • Paul McCartney, Michael Jackson
  • Stevie Wonder, Paul McCartney
  • Kanye West, Estelle
  • Amy Whinehouse, Ghostface Killah
  • Li Wayne, Jay Sean
  • Elton John, Mary J. Blige
  • Aretha Franklin, George Michael
  • Diddy, Sting
  • Kanye West, Chris Martin
  • Jay Z, Mr. Hudson

"Butterflies" written by Marsha Ambrosius for Michael Jackson

King of pop Michael Jackson tapped U.K. singer/songwriter Marsha Ambrosius for the ballad "Butterflies" off his last LP, Invincible. The sultry British vocalist also sung background vocals on the song, which peaked at No. 2 on Billboard charts.

(Photos from left: Frederick M. Brown/Getty Images, Barry King/WireImage)

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