Bill Murray is ready to rock audiences with his new concert film. Nearly four years after the actor-comedian headlined a rousing music-and-poetry performance at the Acropolis in Greece, Murray is excited for moviegoers to experience that night through a filmed version of the show that he believes will surprise viewers. “It looks like it’s a serious classical concert piece, and it’s frightening,” Murray told the Daily News. “Terrifying at first, but what isn’t anymore? It’s a little scary, but if you just have faith that, among all of us, there’s a drop of consciousness, it’s going to change, i…