The Rocklahoma music festival rocked out for a good cause on its opening day Wednesday, donating all proceeds to victims of the tornado that struck Picher on May 10.

The twister killed several people and destroyed more than 150 homes in the former lead and zinc mining town.

Dale Simpson, one of the festival's producers, said that when he heard about the tornado, he and Dave Geinke, the festival's owner, decided to add a day to the festival.

Because the donation will be based on ticket sales, Simpson said he wouldn't know how much money was raised until later in the week. Each general admission ticket for Wednesday brought $25.

All three-day ticket holders and active duty military were admitted free on opening day.