Underbase: Fallen: Down

To understand the foundation of "Underbase," it helps to know the original's structure:

: The primary melody is based on "Fallen Down," the fourth track of the Undertale OST, originally composed by Toby Fox. Underbase: Fallen Down

: In Undertale , this theme plays during interactions with Toriel in the Ruins. Learning to Play To understand the foundation of "Underbase," it helps

: The main version is in 3/4 time , while the "Reprise" version shifts into 6/8 during its waltz section. To understand the foundation of "Underbase

: Written in the key of D Major . The intro specifically starts on an F# note.