The production of Oedipus Rex was musically based. The director wanted the feel of many musicians onstage, even though there was only one.  That desire encouraged me to ensure that all of my effects had a melodic base.  For the choral odes, the percussionist maintained a basic rhythm, while I created the effects that accented the words that the chorus chanted.  The show relied heavily on sound to create the mystical world, and I felt that the effects accomplished the goal.