Joe Penhall’s ‘Mood Music’ premieres at the beautiful Old Vic Theatre, which perfectly lends to the grandeur that these musicians would be used to. The stage is completely open, appearing bigger than it might do with elaborate sets but the simplicity of this set doesn’t hide anything, perhaps award-winning set designer Hildegard Bechtler intended this to be expressive of the revelations we learn from these characters as they go through psychotherapy.