Artists, the human assets, are asserting greater independence. Some, like Mariah Carey, demand more money. Others, like George Michael, walk out on their labels when the wind changes. Desperate executives yield vast tracts of money and power to hold onto waning stars. EMI's £80million? Maria Carey signing from Sony made sense for about six hours. In the cold light of day, Carey looked like a falling star with appalling personal problems - her marriage to the Sony boss had broken up - and a shrinking teen following. The £35million write-off after the flop of her debut disc was inevitable.