Kanye West and Jay-Z onstage

Kanye West and Jay-Z onstage

Richard Vines, Bloomberg News

U.S. rappers Kanye West and Jay-Z perform "Otis" on their European tour against a backdrop of a giant U.S. flag and as fireflares go off. The tribute to Otis Redding, as done at London's O2 arena on May 18, 2012, is a track on their album "Watch the Throne."