== 1 billion sales caterogry == 
 Someone keeps removing the 1 billion sales for no apparent reason. Both the artists in this cateogry are backed up by readily verifiable sources, one from guiness world records and the other from the official website. These sourced figures are twice as high as the previous 500 millions section, so it should warrent its own. And before anyone even starts up on debating the truthfulness of these figures remember, wikipedia is based on verifiability, not truth.