Start Menu

Start Menu is the 2nd track in the Undertale Soundtrack and the Undertale Demo OST (where it is called "Menu.") It plays whenever the player is viewing a new file.
After the player views the True Pacifist Ending Credits and gains the option to do a True Reset, this track plays at x0.1 speed.
The track is played at 0.9 speed in the Fangamer Demo.
== Variations ==
There are seven variations of this track. Only two of these variations are included in the official Undertale Soundtrack: Start Menu, and Menu (Full). Menu (Full) plays at the end of the True Pacifist Route but before viewing the credits.
In the Undertale Demo OST, it plays select parts of four of these variations, as opposed to the singular section played in the Undertale Soundtrack. Interestingly, one of the sections appears to be a modified version of Menu (Full) which removes instruments. It can be found in the Undertale Demo's files.
Every subsequent iteration of this track adds instrumentals directly related to how many characters the protagonist befriends.
Image	Audio	Description
 	 	Default, contains only square wave melody, and a noise channel imitating a snare drum.
 	 	Met Flowey, adds syncopated bassline from the source material, Once Upon a Time.
 	 	Spared Toriel, adds a piano harmonizing the melody, and doubles the bassline.
 	 	Befriended Papyrus, adds more square waves to the harmony, and adds bongos.
 	 	Befriended Undyne, adds strings doubling the piano's part, and adds claves.
 	 	Befriended Alphys, adds glockenspiel doubling the melody, and a deeper double of the bassline.
 	 	Saved Asriel Dreemurr. Adds sustained strings, and counter-melodies from the piano. It also quotes the C section from Once Upon a Time, from 0:21-0:32. mus_menu6 also acts as a separate track in the OST, Menu (Full).
== References ==
de:Start Menu
es:Start Menu
fr:‎Start Menu
pl:Start Menu
pt-br:Start Menu
ru:Start Menu
zh:開始目錄