By Scott Tobias For the first time in its history, the Emmys are honoring the art of music supervisors, those audio excavators who dig up the perfect song to set a mood, evoke a setting, or express a character’s feelings more succinctly than any line of dialogue ever could. “Music can be used as costumes are — or as art direction, as casting,” says Thomas Golubic, a nominee for “Better Call Saul.” “It is absolutely vital in helping best tell a story.” Golubic joins a freshman