Country star Blake Shelton is rushing to the rescue of his fellow Oklahoma natives by organizing and performing at the upcoming Healing in the Heartland benefit concert, which is set to air live on Wednesday night (May 29). And now even more stars have been added to the already impressive lineup.

Luke Bryan, Rascal Flatts and Ryan Tedder from One Republic have been added to the show, for which Shelton partnered with NBC. Both Tedder and Joe Don Rooney from Rascal Flatts have strong ties to Oklahoma.

The new acts join previously announced stars including Miranda Lambert, Reba McEntire and Vince Gill. The benefit concert -- which sold out in an astounding 30 seconds when tickets went on sale -- will air live from Chesapeake Energy Arena in Oklahoma City on Wednesday night at 9PM ET on NBC, and will also air on cable networks Style, G4, E!, Bravo and CMT. It will be staged like a telethon, with viewers having the option of donating as they're watching live.

The concert is to raise money to aid victims of the deadly tornado that ripped through Moore, Okla. last week. “Everyone has their way to help, and mine as an entertainer is to perform to help raise money and awareness for this tragedy,” Shelton says (quote via TV By the Numbers). “This is why I want to do this special and especially hold it in Oklahoma City, which is near ground zero.”

The money raised from the event will go to the United Way of Central Oklahoma May Tornadoes Relief Fund. You can also help by making a $10 donation to the Red Cross. Just text REDCROSS to 90999, or call 1-800-REDCROSS.