Octavia Philharmonica has betrayed her friends and allied with the corrupt nobles of Luna's Court, but her usefulness is at an end. After a discovered attempt to redeem herself and save her friends from the politicians, she finds herself compelled to play the infamous Symphony for Moon and Sun -- a piece from which no musician's career has ever escaped intact. Princess Luna hates the piece and shuns anypony who dares play it, and no venue will host a pony shunned by the princess of Equestria. In her desperate straits, her only hope is the aid of her former student Lyra Heartstrings... but not only is Lyra still feeling the effects of Octavia's betrayal, but Octavia isn't even sure that she deserves the help. Can Lyra get through to her former teacher and help her survive the most important performance of her career? Or will both of them find their careers crashing to a premature end? Lunaverse story.