Summary
'Don't Forget' is easily the most prominent leitmotif in Deltarune , and is accordingly very important for lore analysis, especially in regards to its lyrics.
The melody itself is split into two somewhat distinct halves, which appear on their own on occasion:
Field of Hopes and Dreams )
The full melody:
Field of Hopes and Dreams )
These two halves of the melody are connected via a distinct set of three descending notes, which are used on their own on occasion:
Friendship )
Finally, we have two extraneous parts of the melody:
Field of Hopes and Dreams )
Game Main Theme (Piano Sketch) )
Before recapping lyrics and heading into its appearances, it should be noted that 'Don't Forget' often appears alongside 'Hopes and Dreams' and 'Hometown' .
Appearances
Beginning
'Don't Forget': 0:06-0:39
'Once Upon a Time' and 'Girl Next Door' )
School
'Don't Forget B': 0:27-0:41
'Hometown (Extra 1)' before heading into 'Hopes and Dreams' .
Field of Hopes and Dreams
'Don't Forget (Intro)': 0:00-0:45
Past the opening of the song, 'Don't Forget (Intro)' appears in a form more similar to its appearance in Scarlet Forest :
'Don't Forget (Intro)': 0:46-0:53, 2:10-2:18, 2:25-2:33
'Don't Forget': 0:53-1:00, 2:18-2:24, 2:33-2:41
At 1:00-1:15, 'Don't Forget A' is heard on its own:
'Don't Forget A': 1:00-1:15
Leading into a more fleshed-out quote of the full melody at 1:15-1:39:
'Don't Forget': 1:15-1:39
Finally, at 1:39-2:10, the full melody is remixed:
'Don't Forget': 1:39-2:10
Scarlet Forest
In Scarlet Forest , 'Don't Forget (Intro)' and 'Don't Forget A' first appear interspliced with 'Gaster's Theme':
'Don't Forget (Intro)': 1:23-1:27, 1:31-1:32, 1:39-1:43, 1:47-1:48
'Don't Forget A': 1:32-1:35, 1:48-1:51
Together (with 'Gaster's Theme'): 1:20-1:51
From there, the song progresses to a full quote of 'Don't Forget (Intro)' and 'Don't Forget':
'Don't Forget (+ Intro)': 1:52-2:08
(See also: 'Scarlet Forest' )
THE WORLD REVOLVING
'Don't Forget B': 1:20-1:41
(See also: 'THE WORLD REVOLVING' and 'The Door' )
Friendship
'Don't Forget': 0:00-1:33, 2:18-2:30
'Don't Forget (Bridge)': 1:43-2:17
Your Power
'Don't Forget B': 0:01-0:10
A Town Called Hometown
'Don't Forget B': 1:01-1:27
School , this quote is capped off with 'Hometown (Extra 1)' leading into 'Hopes and Dreams' .
You Can Always Come Home
'Don't Forget B': 0:56-1:38
'Hometown (Extra 1)' .
(See also: 'Home' and 'Once Upon a Time' )
Don't Forget
'Don't Forget': 0:02-0:43
Faint Glow
'Don't Forget A': 0:00-0:51
'THE HOLY' )
Later in the song, 'Don't Forget A' properly progresses to the full melody:
'Don't Forget': 0:51-1:17
The Dark Truth
'Don't Forget': 0:31-1:07
Note that in this quote, the melody is started with a quote of 'Girl Next Door (Extra)' .
(See also: 'Your Best Nightmare' )
Until Next Time
In Until Next Time , the melody is chopped up and mixed around to give a 'glitchy' feel.
'Don't Forget A': 0:00-0:52
'Don't Forget B': 0:18-0:20, 0:25-0:28
'Don't Forget B': 0:44-1:01
Dog Check
'Don't Forget B': 0:33-0:41
'Once Upon a Time' and 'Dogsong' )
Game Main Theme (Piano Sketch)
'Don't Forget': 0:00-0:28, 0:41-1:04
'Don't Forget (Unused)': 0:28-0:39
'Don't Forget B': 0:39-0:41
School (alternate)
'Don't Forget': 0:00-0:51
'Don't Forget (Unused)': 0:28-0:51
'Don't Forget (Bridge)': 0:54-1:19
'Don't Forget B': 1:19-1:21
Hometown Day
'Don't Forget B': 0:41-1:12
'Hometown (Extra 1)' .
(See also: 'Snowy' and 'Hopes and Dreams' )
My Funky Town
'Don't Forget B': 1:07-1:08, 1:22-1:23
'The Legend' )
UNDERTALE - Launch Trailer | PS4, PS Vita
Somewhat shockingly, 'Don't Forget (Intro)' and 'Don't Forget B' appear in the Undertale PS4 launch trailer,
Specifically, at certain points of the song, it appears in a piano jingle, accenting the melody of 'Once Upon a Time A' :
'Don't Forget (Intro)': 0:36-0:37, 0:50-0:51, 1:04-1:05
'Don't Forget B': 0:39-0:41, 0:43-0:44, 0:52-0:55, 0:57-0:58, 1:06-1:08, 1:10-1:12
(That's a lot of numbers, so here's the part of the song that has all of that, in full):
(See also: 'Rude Buster' )