In this week’s episode of 'Smash,’ titled 'The Coup,’ Julia (Debra Messing) confides in her husband Frank that she worries Marilyn the musical is dead. In a goofy attempt to lift her spirits, he plays 'Guitar Hero,' singing for her 'Don’t Worry be Happy.' Meanwhile Karen (Katharine McPhee) meets Derek (Jack Davenport) at a café, where he reveals to her that he is looking to bring in a new songwriter to replace Tom. He wants Karen to sing it, but Julia and Tom (Christian Borle) cannot know. Much to everyone’s surprise, Karen agrees.