On The Voice, they're coaches. On American Idol, they're judges. On Rising Star, they're experts. And on every singing competition show, they're camera hogs.
In case you weren't aware after the 247th announcement during this past weekend's Sunday Night Football broadcast on NBC, The Voice returns next Monday with a pair of new faces on its four-coach panel. The move has already drummed up plenty of interest in this season's coaches, who -- if recent hist...
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