Salaried artists.

Here's a very interesting Wikipedia nugget: At the SXSW conference in 2006, Interscope lawyer Darryl Franklin said during a panel discussion, that the contract with the group The Pussycat Dolls is unique in that its members are actually salaried employees of the record label and, by design, completely interchangeable. This means that in addition to CD sales, the label also controls merchandise, web sites and all other commercial aspects of the group and their income, excluding songwriting. (source)