Back in Black contains some of AC/DC's biggest hits, including "Hells Bells", "You Shook Me All Night Long", and the title track "Back in Black." According to Angus Young the album's all-black cover was a "sign of mourning" for Scott, as black is the traditional Western colour of mourning. It is AC/DC's best selling album, the second best-selling album of all time, and the biggest selling album by any band, with more than 42 million copies sold worldwide.[4] In 2006 Back in Black was certified by the Recording Industry Association of America as the fifth best-selling album in the United States, with 22 million copies sold.[5] Despite its massive commercial success, it is not AC/DC's highest charting album in the U.S, peaking at #4; their next album, For Those About to Rock We Salute You, h