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Usher, Blake Shelton, Healing in the Heartland

Trae Patton/NBC

Blake Shelton and Usher are singing their hearts out on behalf of Tornado victims.

The Voice coaches joined forces for the finale of the Shelton's Healing in the Heartland: Relief Benefit Concert Wednesday night, offering up a poignant duet of Michael Bublé's song "Home."

The performance at Chesapeake Energy Arena in Oklahoma City capped off an evening that paid tribute to those affected by last week's devastating twisters that tore through Shelton's native Oklahoma, as a roster of A-listers helped raise necessary funds for rebuilding.

Screening behind Shelton and Usher were images of the catastrophe, along with the heroic first responders who helped aid survivors.

Other artists who took part in the sold-out show of 20,000 included fellow Okie Reba McEntire, Rascal Flatts, Darius Rucker, Ryan Tedder, Luke Bryan and Shelton's wife, Miranda Lambert, who burst into tears during an emotional rendition of "The House That Built Me." No word yet how much cash was raised.

Shelton also organized a Healing the Heartland auction on eBay that will run through June 3.

Proceeds from the sale of items—such as signed hats from his fellow country stars and VIP concert tickets—along with the money raised from last night's star-studded relief concert will go to The United Way of Central Oklahoma May Tornado Relief Fund.

To make a donation, text REBUILD to 52000.

(E! and NBC are both part of the NBCUniversal family.)