NEW YORK — A much-anticipated performance by Whitney Houston in hologram form won't air on NBC's "The Voice" next week after all.The performance, which would have paired the late singer with Christina Aguilera, a "Voice" celebrity coach, was expected to air on Tuesday's season finale. But the high-tech duet has been cancelled for technical reasons.Pat Houston, the late superstar's sister-in-law and head of her estate, explained that "holograms are new ......
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