Music experts in America expect Madonna's Confessions tour to sail past the $200 million (GBP111 million) mark, which will make the pop superstar the top female performer ever. Cher currently holds the record with $192.5 million (GBP107 million) from 273 shows on her recent "farewell" world tour. Madonna's figures, predicted by music industry trade magazine Billboard, are astonishing when you consider she is expected to play less than 60 dates.