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Once Upon a Time

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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.

Trivia

  • This track plays at 90% speed in-game. In the original soundtrack, it plays at the same speed as it does in-game.
  • 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.


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

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