During the end credits of the game, Monika sings a song called “Your Reality,” which is basically just the game's theme song played on the piano. You can find the song, along with all the lyrics, here: https://www.youtube.com/watch?v=zB8uF6uvz-Y You can choose to sing along to the piano accompaniment or just audition with raw vocals; I don't really have a preference at this time.

NOTE: If you audition for the End Credits Singer, I encourage you to also audition for Monika.