Diana Krall performing at the Cool Jazz Fest 2006 at Jardim do Marques de Pombal. Oeiras, Portugal - 18.07.06

The wife of rock icon ELVIS COSTELLO was forced to sing by her musical collaborators, but she always felt more comfortable as purely a pianist.

She says, "I hated it. I thought my voice sucked. It's not until the last two years I've thought maybe I don't suck as a singer."