By Brandy McDonnellCountry singer, pediatric mental health nurse and father of six Michael Ketterer didn't win Season 13 of "America's Got Talent," but he got a heck of a consolation prize thanks to Oklahoma native and Country Music Hall of Famer Garth Brooks.Simon Cowell, who hit his Golden Buzzer for Ketterer during the auditions, put out a request for Brooks to pen a song for the aspiring singer during the semifinals, and in true Garth fashion, the country music icon delivered.