For 20 years, songwriters have been testing out new material at Nashville’s writers haven the Listening Room. On Tuesday night, during a celebration of the Listening Room’s 20th anniversary at the Ryman Auditorium, Hardy stayed true to that tradition by debuting a new song for a sold-out crowd. And it was a doozy. Titled “Tommy Made the News,” it detailed a troubled young man’s final day at school in which he carries out a shooting: “Till 10 a.m. it was just another morning/everybody went a-