Bono and The Edge have made a surprise appearance at a charity gig in London last week, when they played a 4-song set for two hundred and fifty people at Mencap’s Little Noise Sessions at the Union Chapel situated in north London. The musicians opened their set with the composition “Stay,” from 1993’s “Zooropa,” and then performed “Angel of Harlem” and “Desire”. They closed the set with a 1st-time performance of “Wave of Sorrow.” This composition was originally written for their ‘87 album entitled “Joshua Tree.”