Whitney Houston ruled the pop world in the late '80s with a string of infectious hits that included seven consecutive number ones. But when Mariah Carey burst onto the scene at the start of the new decade, America's Sweetheart turned bitter and famously shaded the newcomer in a series of interviews. The vocal powerhouses spent much of the '90s duking it out on the charts, breaking records with their multi-octave ranges. Though they publicly buried the hatchet with a high profile duet, their relationship would forever be marked by competition. In addition to their supreme talent, both women were bonded by personal struggles that threatened to detail their musical careers. When Houston succumbed to her addictions in 2012, it was Carey who led the tributes to the fallen diva.

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