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Mariah Carey's debut album was released in 1990, five years after Houston's. Carey soon joined Houston as a Pop/R&B megastar. They were more or less direct competitors, but perhaps because each was so successful, it didn't seem to matter. In 1998 the two joined forces for "When You Believe," a song on the soundtrack of "The Prince of Egypt," an animated film from Dreamworks.
On Sunday, the day after the news of Houston's death broke, Carey tweeted: "Heartbroken and in tears over the shocking death of my friend, the incomparable Ms. Whitney Houston. My heartfelt condolences to Whitney's family and to all her millions of fans throughout the world. She will never be forgotten as one of the greatest voices to ever grace the earth."
Carey was to appear on "Good Morning America" on Tuesday to discuss losing weight after giving birth to her twins and her role as spokesperson for Jenny Craig.
Her representative reportedly said, "Mariah is still mourning the death of her friend and collaborator Whitney Houston and thought it was too soon to appear on TV to discuss anything else."