A leitmotif (/ˌlaɪtmoʊˈtiːf/) is a musical "phrase" or melody, re-used in multiple songs to associate a tune with a person, event, or place.

The extensive use of leitmotifs in Undertale's soundtrack and other sound files helps create a nostalgic mood for the game and often evokes emotional responses in players. Toby Fox has stated that the majority of Undertale's soundtrack was composed using reiterations of free SoundFonts and synths.[1]

Attempts have been made at documenting all of the leitmotifs used in the game; players frequently find new connections, and it may be impossible to list them all conclusively. Every single piece of data is open to interpretation and every single change must be explained in history description.

Timestamps found below are approximate to one second and are sourced from this playlist, which reflects the timing of the official soundtrack.

Once Upon a Time

Leitmotif once upon a time

This leitmotif can be considered as the main theme of Undertale. It's the most common melody of the game, playing in seventeen tracks.[2]


Flowey has two leitmotifs relating to him.

Your Best Friend

Leitmotif flowey

This leitmotif occurs in seven songs, and one unused audio file.[5]

Your Best Nightmare

This leitmotif is used in four songs and one unused audio file. [7]


Leitmotif toriel

Toriel's theme. This song is used in three songs and one song from the demo OST.[8]


Leitmotif ruins

This leitmotif can be considered as the Underground theme, appearing in twelve official songs and 2 unused sound files.[9]

Enemy Approaching

Leitmotif anticipation

This leitmotif is related to enemies or dogs. It appears in seven songs and one unused song.[11]

Ghost Fight

Leitmotif ghost

This leitmotif is used in five songs.[14]


Leitmotif determination

The leitmotif for death. This song is used in two songs, one unlisted song and an unused audio file.[15]


Leitmotif sans

Sans' theme. Found in four songs, one of which is never played in the game.[16]


Leitmotif papyrus

Papyrus' theme. Found in four songs, one of which is never played in the game.[17]


These leitmotifs have two separate meanings to them.


Leitmotif hopes

The theme of Snowdin. Used in six songs.[19]


Used to represent friendship, love or happiness. Used in eight songs.[21]


Leitmotif undyne

Undyne's theme. Used in eight songs.[22]

Another Medium

Leitmotif another medium

Theme of Hotland. Used in five songs.[24] The theme originates from the song "Doctor" from Homestuck.[25]


Leitmotif alphys

Alphys' theme. Used in five songs, one of which was unused.[26]


Mettaton's themes.

It's Showtime!

Leitmotif showtime

Mettaton's main theme. Found in four songs and at least one other sound file.[27]


The bassline of It's Showtime! is present in three Mettaton-related songs. It is considered as a separate leitmotif, as it has an entirely different melody.

Metal Crusher

Leitmotif mettaton

Mettaton's battle theme. Used in three songs.[28] This leitmotif originates from Noisemaster's Theme from Cucumber Quest. [29]


Leitmotif bergentrückung

Asgore's theme. Used in three songs.[30]


Leitmotif his theme

Asriel's theme. Used in five songs.[31]

  • Memory
  • Undertale 0:00-2:47, 3:27-6:21 (at times, the melody is barely perceptible among overlapping music. It is heard on a guitar for most of the song, becoming hard to distinguish after 3:27 ; the tune switches to a more audible sample after 4:42, to a quiet background piano at the key change around 5:20, and back to the second SoundFont at 5:57)
  • The Choice (imperceptible), as it is a part of Undertale which contains the barely-audible Memory
  • Finale 0:40-0:57[32]
  • His Theme


Minor Leitmotifs

Uncommon leitmotifs. [33]

Similar samples


  1. Toby Fox on Twitter (deleted post)
  2. (Undertale) Once Upon a Time Leitmotifs - YouTube
  3. Undertale Main Menu Music Easter Egg - YouTube
  4. I heard that if you sped up “The Choice”... - Tumblr
  5. [Version 2 Undertale - All songs with the "Your Best Friend" melody/leitmotif] - YouTube
  6. Undertale OST "But Nobody Came" Sped up 1200% - YouTube
  7. Your Best Nightmare Leitmotifs - YouTube
  8. Fallen Down Leitmotifs - YouTube
  9. Ruins Leitmotifs - YouTube
  10. Possible Leitmotif? - YouTube
  11. Enemy Approaching Leitmotifs - YouTube
  12. ibid. beginning at 2:46
  13. it's all connected - YouTube
  14. Undertale - All songs with the "Ghost Fight" melody/leitmotif - YouTube
  15. Undertale - All songs with the "Determination" melody/leitmotif - YouTube
  16. sans leitmotifs. - YouTube
  17. Undertale - All songs with the "Bonetrousle" melody/leitmotif - YouTube
  18. "one of the catchiest songs in the OST, reduced to an eldritch horror." - Undertale OST - Bonetrousle (GENOCIDE) Extended - YouTube
  19. Undertale - All songs with the "Snowy" melody/leitmotif - YouTube
  20. 20.0 20.1 Undertale - All songs with the "Snowy" melody/leitmotif - YouTube
  21. Undertale - All songs with the "Snowdin Town" melody/leitmotif - YouTube
  22. Undyne Leitmotifs - YouTube
  24. Area Bells Leitmotifs - YouTube
  25. See Patient
  26. Undertale - All songs with the "Alphys" melody/leitmotif - YouTube
  27. It's Showtime! Leitmotifs - YouTube
  28. Metal Crusher Leitmotifs - YouTube
  30. Undertale - All songs with the "ASGORE" melody/leitmotif - YouTube
  31. Undertale - All songs with the "His Theme" melody/leitmotif - YouTube
  32. Music similarities 2: Undertale: Finale and His theme - YouTube
  33. Minor Leitmotifs - YouTube
  34. Undertale: Barrier sped up 90% - YouTube
  35. W. D. GASTER "Mus_Smile" Dissected!" - YouTube