Proceeds from the fundraiser will benefit military service members affected by Post-traumatic Stress Disorder (PTSD) and Traumatic Brain Injury (TBI).
Retired Staff Sgt. Allen Hill was critically injured in Iraq in November 2007.
While his physical injuries have healed, he still deals with the invisible injuries of PTSD and TBI.
Allen has been in and out of numerous hospitals and residential PTSD treatment programs, most recently The Pathway Home in Yountville, California, where he, along with his service dog, Frankie, finally learned how to better manage his PTSD.
Tim McGraw, Keith Anderson, Luke Bryan, Craig Campbell were among the musicians who participated in Tuesday's shootout.
"They have such a huge platform and such a huge voice that it can make a huge difference erasing the stigma [of PTSD]," said Hill's wife and full-time caretaker, Gina.
"We get up the morning. We go to work, drive our cars, have our homes, have our sense of freedom and security because of those guys," said McGraw, son of baseball player Tug McGraw, who died of brain cancer.
Musician JT Hodges added, "We can't imagine what you go through and we're honored to do this for you and we thank you again."
Nashville Predators forward and wife of country star Carrie Underwood Mike Fisher was also on hand for Tuesday's event.
"It's a great cause," he said, adding, "We know the effects of some of those things that they deal with."