UNDERTALE complete OST and music easter eggs guide. *Spoilers

Overview

Welcome to the MTT brand UNDERTALE official soundrack guide!I need a shorter name.Anyway, this guide contains a list of every song on the UNDERTALE soundtrack, with information such as where does it appear in the game and what other tracks are INSIDE it.

The Guide

1. Once Upon a Time (Intro)
2. Start Menu (Main game menu) – Once Upon a Time
3. Your best friend (Meeting flowy for first time)
4. Fallen down (Meeting Toriel) – Once Upon a Time
5. Ruins (Ruins Background music)
6. Uwa!! So Temperate ♫ (Options menu while in the ruins)
7. Anticipation (Fighting the DUMMY and the first FROGGIT)
8. Unnecessary Tension (Walking the long room)
9. Enemy Approaching (Fighting monsters in the Ruins, Snowdin, Waterfall and Hotland. – Anticipation
10. Ghost Fight (Napstablook battle theme)
11. Determination (Game over theme)
12. Home (A house near a city named “Home”) – Once Upon a Time.
13. Home (Music Box) (Turning the lights off in your room in Toriel’s house) – Home
14. Heartache (Toriel’s battle theme)
15. Sans. (Meeting Sans, Papyrus and Sans’ house theme)
16. Nyeh Heh Heh! (Meeting papyrus for the first 3 times and pre blue attack battle theme).
17. Snowy (Snowding background theme)
18. Uwa!! So Holiday ♫ (Options menu while in snowdin) – Uwa!! So Temperate ♫
19. Dogbass (Dogamy and Dogressa are smelling you) – Ghost fight
20. Mysterious Place (Near the door to Dog Room)
21. Dogsong (Annoying Dog and Greater Dog battle Theme) – Enemy Approaching.
22. Snowdin town (Snowdin town background theme) – Snowy
23. Shop (Snowdin shop, Waterfall shop And Glamburger shop theme) – Snowding town
24. Bone Trousle (Papyrus Battle theme post blue attack) – Nyeh Heh Heh!
25. Dating Start! (Dating papyrus, Catty and Bratty shop theme) – Snowdin Town.
26. Dating tense (Papyrus date when he is suspicious or when inspecting him) – Dating Start!
27. Dating Fight! (Tension part of date, date power) – Dating Start!
28. Premonition (Sans first date)
29. Danger Mystery (Meeting undyne for first time)
30. Undyne (Undyne sees you)
31. Waterfall (Waterfall background theme) – Ruins

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32. Run! (Escaping from Undyne sequence)
33. Quiet Water (Waterfall #2 theme) – Waterfall
34. Memory (Statue music box if you give it an umbrella, Undyne story music, music that plays when you spare Asgore)
35. Bird That Carries You Over A Disproportionately Small Gap (Plays when a little yellow bird carries you through Waterfall)
36. Dummy! (Dummy battle theme) – Ghost fight.
37. Pathetic House (Napstablook’s house background music, in waterfall) – Dummy!
38. Spooktune (Napstablook’s disk #1) – Dummy!
39. Spookwave (Napstablook’s disk #2) – Dummy!
40. Ghouliday (Napstablook’s disk #3) – Dummy!
41. Chill (Feeling like garbage with napstablook)
42. Thundersnail (Thundersnail minigame theme in waterfall) – Dummy!
43. Temmie Village (Temmie village background music) – Dogsong
44. Tem Shop (Tem shop theme) – Temmie Village
45. NGAHHH!! (Plays at undyne’s speech pre-battle) – Waterfall.
46. Spear of Justice (Undyne battle theme) – NGAHHH!!
47. Ooo (Hotland background theme #1) – It’s literally Toby blowing into a microphone at slow motion…
48. Alphys (Alphys theme) – Bird That Carries You Over A Disproportionately Small Gap
49. It’s Showtime! (Plays when mettaton first shows up and in the cooking show with Mettaton)
50. Metal Crusher (Mettaton quiz theme, Mettaton battle theme #1) – It’s Showtime! Not fully confirmed: Dummy!
51. Another Medium (Hotland background theme) – Waterfall. Originally a remix of song in HomeStuck.
52. Uwa!! So HEATS!! ♫ (Options menu theme when progressed to Hotland) – Uwa!! So Temperate♫
53. Stronger Monsters (HardMode battle theme) – Enemy approaching.
54. Hotel (MTT Resort background theme) – Once Upon a Time.
55. Can You Really Call This A Hotel, I Didn’t Receive A Mint On My Pillow or anything (MTT Resort room hallway background theme) – Hotel.
56. Confession (After acting a certain way in the royal guards battle) – Dating Start!
57. Live Report (Mettaton’s news report theme #1) – It’s Showtime!
58. Death Report (Mettaton’s news report theme #2) – Live Report
59. Spider Dance (Muffet battle theme) – Dummy!
60. Wrong Enemy?! (So Sorry battle theme) – Dummy!
61. Oh! One True Love (Mettaton Musical theme)
62. Oh! Dungeon! (Mettaton’s colored puzzle theme) – Oh! One True Love
63. It’s Raining Somewhere Else (Sans date theme #2) – Sans., Once Upon a Time.
64. CORE Approach (Bridge between MTT Resort to CORE background music) – Hotel.
65. CORE (CORE background music) – Another Medium
66. Last Episode (Mettaton pre-bottle theme) – Metal Crusher.
67. Oh My… (Mettaton pre-bottle voice file) – Recorded by Toby Fox.
68. Death by Glamour (Mettaton battle theme #2) – CORE, Metal Crusher, It’s Showtime! Not fully confirmed: Dummy!
69. For the Fans (Mettaton spare theme) – Oh My Love
70. Long Elevator (Elevator to New Home woosh sound file)
71. Undertale (New Home background theme) – Once Upon a time, Memory.
72. Song That Might Play When You Fight Sans (Sans battle theme #1) – Sans., Dummy!, Bone Trousle.
73. The Choice (Sans sparing you theme, Asgore gives up theme) – Undertale.
74. Small Shock (Meeting asgore theme)
75. Barrier (Barrier sound file, “The End”) – Once Upon a Time slowed down.
76. Bergentrückung (Asgore pre-battle theme)
77. ASGORE (Asgore battle theme) – 76. Bergentrückung, Heartache, Determination.
78. You Idiot (Asgore death / Omega Flowy pre-battle theme)
79. Your best Nightmare (Omega Flowy battle theme) – Your Best Friend, You Idiot.
80. Finale (Omega Flowy battle theme after all the souls) – Your best friend, Memory.
81. An Ending (Neutral run end phone call theme) – Ruins.
82. She’s Playing Piano (Undyne pre-date theme) – Alphys.
83. Here We Are (True lab background theme) – Alphys.
84. Amalgam (Amalgamates battle music) – Stronger Monsters.
85. Fallen Down (Reprise) (Asgore fight alternate ending theme) – Fallen Down, Dating start!
86. Don’t Give Up (Friends protecting you while in flowy’s trap theme) – Waterfall
87. Hopes and Dreams (ASRIEL DREEMURR battle music) – Once Upon a Time, Your Best Friend, Dating Start!
88. Burn in Despair! (ASRIEL DREEMURR 2nd form pre-battle music) – Your best nightmare.
89. SAVE the World (ASRIEL DREEMURR 2nd form battle music) – Hopes and dreams
90. His Theme (ASRIEL DREEMURR’s story and speech theme, ASRIEL DREEMURR’s post-battle theme) – Memory
91. Final Power (Asriel’s souls release cutscene background music) – Hopes and Dreams reversed.
92. Reunited (Post-Final boss background theme for all areas) – Waterfall, Once Upon a Time. Not fully confirmed: Distorted parts from Metal Crusher and Memory
93. Menu (Full) (Options menu post-final boss) – Once Upon a Time
94. Respite (Ending cutscene background music) – Waterfall, Reunited (Second voice)
95. Bring It In, Guys! (Credits scene) – Enemy approaching, Sans., Bone Trousle, Spear Of Justice, Death by Glamour, CORE, Bergentrückung, Fallen Down, Once Upon a Time.
96. See Last Goodbye
97. But the Earth Refused to Die (Undyne the Undying pre-battle transformation theme) – Waterfall
98. Battle Against a True Hero (Undyne the Undying battle theme) – Waterfall.
99. Power of –NEO- (Mettaton NEO battle theme) – Battle Against a True Hero.
100. MEGALOVANIA (Sans #2 battle theme). – Used in Toby “Radiation”‘s Earthbound Halloween hack. Named after “Megalomenia”.
101. Good Night (Undertale true pacifist route ending theme) – Once Upon a Time.

Last Goodbye

Last Goodbye
This songs that plays at the special thanks credits scene is the only original song Toby made after finished programing the game.
It starts as a remix of SAVE The World but near the end, there is a remix of:

• Snowdin town
• Metal crusher
• Dog Song
• Power Of -NEO-
• Temmie Village

There are probably more songs there, I spent an hour on this track and I will be glad if you can invest on it too.

Anyway, thanks for supporting and if you notice a mistake or find more you can write it down and I will add it!