System of a Down frontman Serj Tankian is secretly working on a new musical with playwright Steven Sater.
The rocker is reportedly turning Greek tragedy "Prometheus Bound" into a stage spectacular, and he has already written eight tunes for the project.
Tony Award winner Sater is among the names behind Broadway hit "Spring Awakening." The new musical will open in Boston, Massachusetts before moving to New York. No dates or theatres have been announced.