Liv Warfield had Simon Cowell thanking her endlessly after her America’s Got Talent audition this June. The performer took to the stage and blew everyone away with her vocal ability. Simon apologized to the singer as he said he “couldn’t give her a yes.” The America’s Got Talent acts are setting the bar super high this year. Janitor Richard Goodall hid his singing talents for years before auditioning for the show. Now, Liv Warfield shows the judges what she’s got. The AGT star has a whole brass band come out on stage before she surprises everyone with her voice. Liv brings energy to the show t…