Music
Rex Features
The music mogul said Carey was wrong to try her hand at different styles of music and should concentrate on recording love songs.
"To me, the greatest singer is Mariah Carey, but she's lost it," he told Live magazine.
"She needs to go back to singing ballads. You have to stick with doing what you do best. Be honest. Know yourself."
Cowell added that he believes protégé Leona Lewis could "top" Carey's success in the future.
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