Luke Bryan , Darius Rucker and Rascal Flatts have been added to the lineup for the Healing in the Heartland: Relief Benefit Concert concert in Oklahoma City Wednesday night. Blake Shelton is organizing the event, and Miranda Lambert , Reba and Vince Gill are also on the bill. One Republic 's Ryan Tedder and Usher have been added to the show too.
NBC will broadcast the concert live at 9 p.m. ET. Tickets for the show sold out in under five minutes after going on sale Saturday morning.
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