Country star and Oklahoma native Blake Shelton is organising a benefit concert for victims of the tornado that ravaged his home state on Monday (20May13). The Voice mentor, who was born in Ada, Oklahoma, is working swiftly to plan a TV special to pull in much-needed funds for the thousands left homeless by the devastating storm. He tells Billboard.com, "We'll know more about it in the next 24 hours. I'm hoping it will raise a lot of money. Obviously it will be televised and will happen really quickly." The singer, who still has a home in Oklahoma, hinted that his The Voice co-stars Usher, Shakira and Adam Levine will make appearances, adding, "I can call in some really big favours." Shelton and his wife Miranda Lambert paid tribute to Oklahoma victims on the U.S. talent show on Tuesday night (21May13) by performing their emotional ballad Over You.