Thom Yorke made a surprise appearance at Flea ‘s concert in London last night, stopping by to perform their recent song “Traffic Lights” and a cover of Marvin Gaye ‘s 1977 hit “Got to Give It Up.” Flea is currently on the European leg of his solo tour in support of his recent album, Honora . Last night, he played his only solo gig in the U.K. at London’s Koko, where he welcomed Yorke to the stage. The duo have collaborated live numerous times in the past, and performed together as Atoms of