On Star’s Song Day, Star and Marco work with principle songstrel Ruberiot to create a ballad for the event.
- Eden Sher as Star Butterfly
- Adam McArthur as Marco Diaz
- Patrick Stump as Ruberiot
- Grey DeLisle as Moon Butterfly
- This is the fourth half hour-long episode in the series, following "St. Olga's Reform School for Wayward Princesses", "Storm the Castle" and "Bon Bon the Birthday Clown".
- Patrick Stump, lead vocalist for the rock band Fall Out Boy, guest stars as Ruberiot.
- Star's crush on Marco was revealed to both Marco, her parents, and all of Mewni.
- The voice of Dennis, Atticus Shaffer, co-stars with Eden Sher (Star Butterfly) on the ABC sitcom, The Middle.
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