Usher is a coach alongside concert organizer and headliner Blake Shelton on NBC's "The Voice."
The fundraising concert is to take place Wednesday at Chesapeake Energy Arena in Oklahoma City.
The event will raise money for the United Way of Central Oklahoma May Tornadoes Relief Fund, NBC said.
The natural disaster, which ripped through the town of Moore, Okla., May 20, killed 24 people, injured 240 and displaced tens of thousands.
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