Persuing his dream of becoming a famous musician, Treble Clef visits Ponyville where his cousin Octavia lives. Upon finding out she's roommates with the famous DJ-PON3, Treble attempts to best Vinyl in the thing they both know best: making music. Will Vinyl prove to him that she's no pushover when it comes to her passion? Or will Treble show her what being a musical prodigy is all about?