1. Deborah Voigt, 47

An American dramatic soprano, Voigt lost 135 pounds after gastric bypass surgery in 2004. She is now singing major Wagner roles. Voigt has no endorsements.

2. Anna Netrebko, 36

The charismatic Russian-born soprano currently helps promote the jewelry company Chopard and BMW's Clean Energy program. Chopard compensates Netrebko both in money and in jewels, some of which she is allowed to keep. The rest are loaned to her for the length of her contract. In the past, she has also lent her name to Vöslauer bottled water and O2, a telecommunications company.

3. Rolando Villazón, 36

Last year, the heartthrob Mexican tenor canceled six months of performances for health reasons, but he was back at work in Vienna in early January. Villazón's standard promotion deal with Rolex nets him a watch, some free publicity, and a nominal fee.

4. Renée Fleming, 49

The reigning American lyric soprano, Fleming is one of the few names that can sell out the Met's 3,800 seats. She has a deal with Rolex, for which she received a free watch (as do all Rolex endorsers). She is also paid for her endorsement, though "not a lot," says her manager.