The Voice USA 2014 Gwen Stefani and Pharrell Spark the Fire

Gwen Stefani and Pharrell Williams team up to debut their new single, "Spark the Fire."

• 2014-12-02T19:12:20+00:00
• Duration: 03:51

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The Voice USA 2014, Gwen Stefani, Pharrell, Spark the Fire, Pharrell Williams, Adam Levine, Balke Shelton, the voice, the voice USA, entertainment, tv, televison, reality show, 2014