Last Goodbye
Ready? Let's end all of this for good!
Last Goodbye is the 96th track in the UNDERTALE Soundtrack. This track only plays during the credits after the True Pacifist Route while all the names of the Undertale Kickstarter backers are being shown while the player (as a SOUL) dodges the credits. If the SOUL successfully dodges all the credits, the mysterious door in Snowdin unlocks.
The track has audio samples taken from both Hopes and Dreams and SAVE the World. The piano in this track is Toby Fox playing live. The track's filename, mus_express_myself, references the fact that this is his self-expression.[1]
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There's a song called "Last Goodbye" on the soundtrack. The piano playing on that song is myself playing live. That's my self expression.
— Toby Fox (@tobyfox) on Twitter, January 12, 2016.