3:48 Undertale OST - Gaster's Theme? 5:45 Gaster's Theme [Undertale/Deltarune UST] 5:05 Glitchtale OST - Vantablack [Gaster's Theme] 5:44 Playing All Secret Piano Songs Perfectly + Gaster's Theme – Deltarune Chapter 4 1:48 What If Gaster's Theme Was a Full Song? 4:30 Entry Number 17 - Dark Darker Yet Darker 2:38 KAIZO - Deltarune Secret Boss Theme 7:07 Deltarune - Boltzmann Brain (W.D. Gaster Theme) 8:09 YOUR FAULT (v2) | DELTARUNE Chapter 6 UST (Snowgrave Gaster Final Boss Theme) 5:10 [Undertale Remix] SharaX - Dark Darker Yet Monster 4:59 The Man Who Got Hands - DELTARUNE UST (Fan-Made W.D. Gaster Boss Theme) 2:06 UNDERPANTS - 17 10:11 Random Songs from random media but with the Deltarune Freedom Motif 4:10 Gaster's Waltz (☼︎☜︎✞︎⚐︎☹︎✞︎☜︎) (Deltarune UST) 3:29 King of Withered Petals | Deltarune Chapter 5 UST (Fan Animation) 3:00 Underverse OST - Rekindle [XGaster's Theme] 3:14 \"Cracks\" - Gaster's Theme (A Glitchtale Fan Soundtrack by Nevan Dove) 3:23 UNDERTALE - Gaster's theme [ 8th Anniversary ] 3:30 Undertale 2 OST Gaster's Theme + Darker, Darker, Yet Darker Extended mp4 1:00 Gaster with G-man's voice part 2 3:49 Underverse OST - Relight [XGaster's Theme 2] 1:37 Gaster's Theme (OST Version) - Undertale 2:45 Gaster's Theme – UNDERTALE | Arrangement