"Doctor" Duke Beatz, Vinyl's DJ idol, is visiting his friend Neon Lights in Ponyville when he meets his admiring fan. Her reputation precedes her, and he shortly invites her to join him and Neon on an exciting new project... but how will this fantastic opportunity affect Vinyl... and Octavia, who is facing her own issues preparing for a command performance with the Equestrian Orchestra for Princess Luna? Between the Doctor and a very temperamental guest conductor, both musicians will have a lot to handle.