Listening to All Undertale OST be like:

0:00 Once Upon A Time 0:06 Start Menu 0:11 Your Best Friend 0:19 Fallen Down 0:25 Ruins 0:30 Uwa!! So Temperate♫ 0:36 Anticipation 0:41 Unnecessary Tension 0:48 Enemy Approaching 0:52 Ghost Fight 1:01 Determination 1:06 Home 1:14 Home (Music Box) 1:19 Heartache 1:35 sans. 1:43 Nyeh Heh Heh! 1:49 Snowy 1:54 Uwa!! So Holiday♫ 2:01 Dogbass 2:03 Mysterious Place 2:08 Dogsong 2:16 Snowdin Town 2:26 Shop 2:31 Bonetrousle 2:44 Dating Start! 2:50 Dating Tense! 2:59 Dating Fight! 3:09 Premonition 3:20 Danger Mystery 3:27 Undyne 3:33 Waterfall 3:40 Run! 3:43 Quiet Water 3:46 Memory 3:55 Bird That Carries You Over A Disproportionately Small Gap 4:04 Dummy! 4:11 Pathetic House 4:19 Spooktune 4:24 Spookwave 4:27 Ghouliday 4:32 Chill 4:43 Thundersnail 4:57 Temmie Village 5:05 Tem Shop 5:09 NGAHHH!! 5:15 Spear of Justice 5:21 Ooo