Listen to Maroon 5 and Gwen Stefani's Mind-Blowing New Ballad

It was penned by Sia.

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Ever since Adam Levine and Gwen Stefani became co-hosts on The Voice, we've been waiting for the chart-climbing twosome to collaborate. Finally, Maroon 5 and Stefani have put their heads together on a new ballad — and it's sure to cause a stir on the airwaves. Entitled, "My Heart Is Open," and penned by the lyrical genius that is Sia, the wistful number is a vulnerable ode to love lost. "It won't take me long to find another lover but I want you," croons Stefani as only she can set to a riveting piano and strings melody. Listen to the mind-blowing track, below:

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