Ozzy Osbourne I spose, and Gabriella Cilmi, and any one of a number of rappers. (And I'm not saying they are unintelligent, just that they sound it). It's not really the point though. I don't really know how intelligent most singers are because, after the goldfish bowl of the X-factor, we don't really hear them talk very much. Also, in Stacey's case I think hearing her talking voice just makes her singing voice all the more impressive.