"Dallas'" iconic theme song will sound a little different tonight as the TNT series says goodbye to J.R. Ewing (Larry Hagman) with a memorial and funeral. Watch the revised opening credits below, and make sure you have a tissue handy. Exec producers Cynthia Cidre and Michael R. Robin spoke to EW.com about honoring Hagman, the wonderful last image of him captured on film, and how they orchestrated J.R.'s final act.