Happy Ending Song

The "Happy Ending Song" is a song sang by Marceline. It was dedicated to someone who was special to her. In the music video, it highlights some of the key Marceline moments from the series and the general message of the song is that her and her special someone end up with a happy ending.

Trivia

 * This song has never been sung in an episode. It is currently unknown if it is an actual song that will appear in a future episode.