The music of Deltarune comprises multiple soundtrack albums created and scored by Toby Fox and also features guest appearances by Laura Shigihara, Lena Raine and Marcy Nabors.

Lena Raine and Marcy Nabors provided additional transcription and arrangement assistance.

All tracks are written by Toby Fox.Toby Fox has also teased the music for future chapters of the game on his website and Deltarune's email newsletters, including the tracks "Hometown Day," "My Funky Town," "Green Room," and one unused song "Sneaking.

Luhrs also stated that there's "[a] thread of darkness and mystery that weaves through the soundtrack," citing that some of the tracks made him feel "uneasy."

Luhrs said that the soundtrack "has a complete arc," and said that the included tracks "spark of creativity and clever thematic structure.