Duration: ~49:33.

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Unreleased Tracks: (~2:01)

• (0:35) Room of Dog by Toby Fox
• (1:09) Game Main Theme (Piano Sketch) by Toby Fox
• (0:17) Gaster's Theme by Toby Fox

Miscellany by Toby Fox: (~13:22)

• (4:30) Nightmare Knight by Toby Fox
• (1:46) Noisemaster Theme by Toby Fox
• (0:59) Patient by Toby Fox
• (2:16) Terezi's Theme by Toby Fox
• (2:23) The Lemonsnout Turnabout by Toby Fox
• (1:28) Theme by Toby Fox

Music from video games: (~24:44)

• (1:25) A Bad Dream by Mother, Keiichi Suzuki, and Hirokazu Tanaka
• (3:57) Aria di Mezzo Carattere by Final Fantasy, Nobuo Uematsu, and Yoshinori Kitase
• (2:19) Boy Meets Girl by Mother, Keiichi Suzuki, and Hirokazu Tanaka
• (1:02) Cave Theme 1 by Mother, Keiichi Suzuki, and Hirokazu Tanaka
• (1:10) Choose a File by Mother, Keiichi Suzuki, and Hirokazu Tanaka
• (1:37) Dream Maze by Mother, Keiichi Suzuki, and Hirokazu Tanaka
• (1:18) Holding Back Tears by Final Fantasy and Ryuji Sasai
• (2:41) Maya Fey - Turnabout Sisters 2001 by Ace Attorney and Masakazu Sugimori
• (_:__)no duration provided; treated as zero seconds long Moonsong by Cave Story and Daisuke Amaya
• (1:10) Mother 3 Love Theme by Mother and Shogo Sakai
• (_:__)no duration provided; treated as zero seconds long One Fateful Night by Mother, Keiichi Suzuki, and Hirokazu Tanaka
• (_:__)no duration provided; treated as zero seconds long Onett Theme by Mother, Keiichi Suzuki, and Hirokazu Tanaka
• (1:05) Prologue by Mother and Hirokazu Tanaka
• (2:11) Sanctuary Guardian by Mother, Keiichi Suzuki, and Hirokazu Tanaka
• (_:__)no duration provided; treated as zero seconds long Stage 7 (Kirby's Block Ball) by Kirby, Sukezo Ouyama, and Ryoue Takagi
• (3:24) Synchrony by Brandish and Mieko Ishikawa
• (0:55) Welcome, Me by Mother, Keiichi Suzuki, and Hirokazu Tanaka
• (0:30) What a Great Picture! by Mother, Keiichi Suzuki, and Hirokazu Tanaka

Traditional music:

• (_:__)no duration provided; treated as zero seconds long Das Lied vom Musikanten by Traditional
• (_:__)no duration provided; treated as zero seconds long The Entertainer by Scott Joplin
• (_:__)no duration provided; treated as zero seconds long The One Horse Open Sleigh by James Lord Pierpont
• (_:__)no duration provided; treated as zero seconds long Yama No Ongakuka by Katsuhisa Hattori and Takatomo Kurosawa

Other music originating outside Undertale: (~9:21)

• (2:36) Amen, Brother by The Winstons
• (1:16) Casio VL-1 Demo by Unknown Artist
• (2:37) Doctor by Buzinkai and Clark Powell
• (0:54) Doctor (Original Loop) by Buzinkai
• (1:58) unreeeal superhero 3 by REZ and Kenët

Other works originating outside of Undertale: (0:05)

• (0:05) Flowey's Laugh by Warner Bros.