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For the prologue of Undertale, see The War of Humans and Monsters.
Long ago, two races ruled over Earth: HUMANS and MONSTERS.
— Opening Cutscene

Once Upon a Time is the 1st track in the Undertale Soundtrack. It plays during the introduction sequence of the game on every launch. It is the primary leitmotif of the game. Like many of the tracks in Undertale, "Once Upon a Time" is stored at a different speed in the game's files. However, unlike other tracks, the OST version has a lower pitch compared to the version heard in-game.

Trivia

  • This track is used two times in the game; the second is during the fight with the final boss of a Neutral Route after the boss closes the game. Upon relaunch, the track plays normally before leading to a fake version of the original intro before "glitching".
  • This track is loosely based on the track Mother Earth from the first Mother game of the Mother Series.
  • The version in the file mus_story.ogg is stored at 100/91 speed. To normalize this, the game plays it at 91% speed.
  • To get close to the pitch heard in-game from the OST version, increase its pitch by 0.455 semitones.
    • or the other way around: to get close to the OST version from mus_story.ogg, reduce the pitch by half a semitone, then play at 0.91x speed.


Undertale Demo Soundtrack
1 - 10 Once Upon a Time • Menu • Your Best Friend • Fallen Down • Ruins
Anticipation • Unnecessary Tension • Enemy Approaching • Ghost Fight • Determination
11 - 16 Home • Heartache • End • Nyeh Heh Heh! • Home (Music Box) • Empty House
Undertale Soundtrack
1 - 10 Once Upon a Time • Start Menu • Your Best Friend • Fallen Down • Ruins
Uwa!! So Temperate♫ • Anticipation • Unnecessary Tension • Enemy Approaching • Ghost Fight
11 - 20 Determination • Home • Home (Music Box) • Heartache • sans.
Nyeh Heh Heh! • Snowy • Uwa!! So Holiday♫ • Dogbass • Mysterious Place
21 - 30 Dogsong • Snowdin Town • Shop • Bonetrousle • Dating Start!
Dating Tense! • Dating Fight! • Premonition • Danger Mystery • Undyne
31 - 40 Waterfall • Run! • Quiet Water • Memory
Bird That Carries You Over A Disproportionately Small Gap • Dummy!
Pathetic House • Spooktune • Spookwave • Ghouliday
41 - 50 Chill • Thundersnail • Temmie Village • Tem Shop • NGAHHH!!
Spear of Justice • Ooo • Alphys • It's Showtime! • Metal Crusher
51 - 60 Another Medium • Uwa!! So HEATS!!♫ • Stronger Monsters • Hotel
Can You Really Call This A Hotel, I Didn't Receive A Mint On My Pillow Or Anything
Confession • Live Report • Death Report • Spider Dance • Wrong Enemy !?
61 - 70 Oh! One True Love • Oh! Dungeon • It's Raining Somewhere Else • CORE Approach • CORE
Last Episode! • Oh My... • Death by Glamour • For The Fans • Long Elevator
71 - 80 Undertale • Song That Might Play When You Fight Sans • The Choice • Small Shock • Barrier
Bergentrückung • ASGORE • You Idiot • Your Best Nightmare • Finale
81 - 90 An Ending • She's Playing Piano • Here We Are • Amalgam • Fallen Down (Reprise)
Don't Give Up • Hopes and Dreams • Burn in Despair! • SAVE the World • His Theme
91 - 100 Final Power • Reunited • Menu (Full) • Respite • Bring It In, Guys! • Last Goodbye
But the Earth Refused to Die • Battle Against a True Hero • Power of "NEO" • MEGALOVANIA
101 Good Night