@Edent I do sound design for a local theater. I always consider sound and music for a production to start once the audience enters the lobby until they leave at the end of the night. Some of the directors I work with like to collaborate on pre- and post-show aspects of a show. Others leave it to me but are appreciative after the fact. The right pre-show music brings the energy up in prep for the show and post-show keeps the energy up as folks hang around to meet the cast.