We present our work in the development of an interface for an actor/singer and its use in performing. Our work combines aspects of theatrical music with technology. Our interface has allowed the development of a new vocabulary for musical and theatrical expression and the possibility for merging classical and experimental music. It gave rise to a strong, strange, unpredictable, yet coherent, “character” and opens up the possibility for a full performance that will explore aspects of voice, theatrical music and, in the future, image projection. Keywords Theatrical music, computer interaction, voice, gestural control.