UNDERTALE: Underswap (OST):

Ruins

1. His Lament (Once Upon a Time)

2. Progress Report (Start Menu)

3. Dancing with Mushroom (Your Best Friend)

4. Mountain Entrance (Fallen Down)

5. Walking though the Dump (Ruins)

6. Golly, What a Rainy Day! (Uwa!! So Temperate)

7. Learning with Napstablook (Anticipation)

8. Asgore's Advice (Unnecessary Tension)

9. Ruff 'n Tuff (Enemy Approaching)

10. Fighting the Mad Hatter! (Ghost Fight)

11. Hope (Determination)

12. Tea Party Invite

    (Original: Plays when the invitation is given.)

13. Tea Time

    (Original: Plays when the tea party begins.)

14. Tea Party GONE MAD!??!

    (Original: Plays when the Tea Party becomes a Food Fight.)

15. Cozy Old Castle (Home)

16. Cozy Old Castle (Resting) (Home (Music Box))

17. Blazing Heart (Heartache)

18. Progress Report (Variant 1)

    (Original: Plays after the Ancient Capital.)

19. Call Me Paps! (Sans.)

20. comedic drums. (Nyeh Heh Heh!)

21. It's Hot in The Dustbowl (Snowy)

22. Golly, What a Sunny Day! (Uwa!! So Holiday)

23. Blade Bros (Dogbass)

24. Wonders (Mysterious Place)

25. Bob Time (Dogsong)

26. Dustbowl Metropolis (Snowdin Town)

27. Buy Anything (Shop)

28. Rattling Bones (Bonetrousle)

29. Hanging Out. (Dating Start!)

30. Hanging Questions. (Dating Tense!)

31. Hanging Spar. (Dating Fight!)

32. Tension (Premonition)

33. Progress Report (Variant 2)

    (Original: Plays after the Dustbowl.)

34. Dark Place (Danger Mystery)

35. Alphys (Undyne)

36. Woodland Burg (Waterfall)

37. SWING AWAY!!! (Run!)

38. Aster's Warehouse

    (Original: Plays when you enter Aster's shop)

39. Golly, What a Chilly Day!

    (Original: Variant of "Golly, what a ___ Day!")

40. Semi's Fishing Trip

    (Original: Plays when you and Semi goes fishing.)

41. Peaceful Flowers (Quiet Waters)

42. Don't Forget (Memory)

43. The Pink Faced Onion that is Used as a Bridge over the Lake (Bird That Carries You Over a Disproportionately Small Gap)

44. Stage Fright? No... STAGE FIGHT! (Dummy!)

45. Haunted House (Pathetic House)

46. Napstatrack (Spooktune)

47. Mettatrack (Spookwave)

48. Mehtrack (Ghouliday)

49. Angstertrack

    (Original: Angsterblook's track.)

50. Peaceful Chatting (Chill)

51. Monkeys Swinging (Thundersnail)

52. Doge Town (Temmie Village)

53. The G's Shop (Tem Shop)

54. The Big WOOF

    (Original: Plays when you make a big purchase.)

55. Got you NOW! (Ngahhh!!)

56. Axe of Hopes & Dreams (Spear of Justice)

57. Progress Report (Variant 2)

    (Original: Plays after the Woodland Burg.)

58. Wind (Ooo)

59. The Mad Scientist (Alphys)

60. Panic! Here's the TV (It's Showtime!)

61. Maze Game (Metal Crusher)

62. You're Pissing me Off!

    (Original: Plays when you cheat the maze)

63. The Frost Belt (Another Medium)

64. Golly, What a Snowy Day! (Uwa!! So Heats!!)

65. Megalo Strikes (Stronger Monsters)

66. Good Rest in a Winter Wonderland (Hotel)

67. How can this be a Winter Wonderland?! There is no star on the tree! (Can You Really Call This a Hotel, I Didn't Receive a Mint on My Pillow or Anything)

68. Ladies & Gentlemen!

    (Original: Plays when you meet Announcer.)

69. Fight Against the Teevee Goons

    (Original: Plays when you fight Announcer's goons.)

70. Chase Sequence

    (Original: Plays when Announcer chases you)

71. VS. Announcer

    (Original: Plays when you fight announcer.)

72. My Name is Mad Mew Mew. I live at... (Confession)

73. Cross the Street (Live Report)

74. HERE COMES TRUCK-KUN! (Death Report)

75. Fight for Nice Cream (Spider Dance)

76. NICE CREAM RECEIVED! (Wrong Enemy!?)

77. That one Anime Scene (Oh! One True Love)

78. Romance Declined! (Oh! Dungeon)

79. Grillby's

    (Original: Plays when you enter Grillby's.)

80. Smoke Break (With Papyrus) (It's Raining Somewhere Else)

81. Have a Chilly Day!

    (Original: Plays when you finish the break with Papyrus.)

82. Endless Snowstorm (Core Approach)

83. Nexus (Core)

84. WINTER SPECIAL! (Last Episode!)

85. You didn't... (Oh My...)

86. Mad Anime Warrior (Death by Glamour)

87. Doll in Pieces (For the Fans)

88. Progress Report (Variant 3)

    (Original: Plays after the Winter Wonderland.)

89. The Bridge (Long Elevator)

90. Our Tale (Undertale)

91. The Final Push (The Choice)

92. Have a Song that Will Play Only Once for Papyrus (Song That Might Play When You Fight Sans)

93. Falling (Small Shock)

94. The Exit (Barrier)

95. Cœur Brisé (Bergentrückung)

96. Queen (Asgore)

97. Forgiveness

    (Original: Plays when Toriel asks for forgiveness before her death.)

98. Thanks for the Help, Partner (You Idiot)

99. Dancing with Death (Your Best Nightmare)

100. Faint Hope (Finale)

101. The End...? (An Ending)

102. Progress Report (Variant 4)

     (Original: Plays after getting a neutral ending.)

103. She's Trying to Play the Saxophone (She's Playing Piano)

104. Dangerous Mystery (Here We Are)

105. Odd Beasts (Amalgam)

106. Mountain Entrance (Respite) (Fallen Down (Reprise))

107. Endless Motivation (Don't Give Up)

108. Wishes for Monsterkind (Hopes and Dreams)

109. Destruction of Humankind! (Burn in Despair!)

110. Battle Against the Fallen Angel (Save the World)

111. Chara (His Theme)

112. Fulfilling Destiny (Final Power)

113. An Angel Gains Their Wings

     (Original: Plays when Chara's soul ascends away)

114. Our New Home (Reunited)

115. This calls for a Celebration, Folks! (Bring It In, Guys!)

116. Farewell (Last Goodbye)

117. Progress Report (Variant Complete...?)

     (Original: Plays after the Blessed Route.)

118. Different Path

     (Original: Curiosity Route theme)

119. Bereavement

     (Original: Asgore's Curiosity Route.)

120. Not a Comedian Anymore

     (Original: Sans Curiosity Route theme.)

121. Screaming for Help

     (Original: Plays when Susie sees through you)

122. Shining Hope for an Alpha's Reslove (But the Earth Refused to Die)

123. OMEGA BLAST (Battle Against a True Hero)

124. Pissed me Off (Power of Neo)

125. The Strongest Monster (Megalovania)

126. Angered Spirit

     (Original: Plays when you meet Asriel)

127. Farewell (Good Night)

128. Progress Report (Variant Complete) (Menu (Full))

Swap Expansions

#1 Ancient Capital (Ruins/New Home <> Waterfall)

• Talking Rocks <> Echo Flowers

• Froggit<> Shyren

• Whimsun <> Woshua

• Moldbygg <> Moldsmal

• Vegetoid <> Clam Girl

• Migosp <> Goner Kid

• Aaron <> Loox

#2 Dust Bowl (Snowdin <> Hotland)

• Snowy <> Vulkin

• Ice Cap <> Tsunderplane

• Chilldrake <> Pyrope

• Cheerleader (CUT CHARACTER)

• Larpy (CUT CHARACTER)

#3 Dustbowl Metropolis (Snowdin Town <> MTT Resort)

• Snowdrake's Father <> Hot Dog Vulkin

• Shopkeeper <> Hand Receptionist

• Innkeeper <> Diamond Receptionist

• Sleeping Monsters <> Hot Dog Harpy

• Rabbit Kid <> Diamond Boy 1

• Rabbit Girl & Cinnamon <> Diamond Boy 2

• Gift Bear <> Business Dude 1

• Politics Bear <> Business Dude 2

• Scarf Mouse <> Business Manticore

• Nacarat Jester <> Shambling Mass

• Slime Family <> Dragon Family

• The Person Behind the Door <> The Hotel Resident

• Ice Wolf <> Charles

• Library Lizard <> Fish Receptionist

• Library Loox <> MTT Resort Janitor

• Newspaper Editor 1 <> Fuku Fire

• Newspaper Editor 2 <> Skateboard Girl

• Grillby <> Burgerpants

• Big Mouth <> Oni

• Drunk Bun <> Fox Head

• Ugly Fish <> Fickus Lickur

• Red Bird <> Scared Donut Guy

• Punk Hamster <> Dress Lion

#4 Woodland Burg (Waterfall <> Ruins/New Home)

• Elder Puzzler - Gaster Follower 2

• Echo Flowers <> Talking Rocks

• Echo Flower Explainer <> Gaster Follower 3

• Shyren <> Froggit

• Woshua <> Whimsun

• Moldbygg <> Moldsmall

• Aaron <> Loox

#5 Winter Wonderland (Hotland <> Snowdin)

[Read #2]

#6 New Capital (New Home/Ruins <> Waterfall)

[Read #1, #2, & #4]