THREE Indonesian film directors will soon be rocking the Jakarta stage. Starting this week, audiences will be treated to the musical Diana: Rahasia Hatiku (Diana: The Secret of My Heart) directed by Garin Nugroho and presented at the Jakarta Convention Center. Then Joko Anwar will stage Onrop! Musikal at the Taman Ismail Marzuki Grand Theater in November, followed by the musical version of Laskar Pelangi, directed by Riri Riza, scheduled for Dece