!!!!VIDEO NOT FOR KIDS!!!!
OG video: https://youtu.be/2DLwFyVhvYg
Music by Toby Fox
AU differences:
First of all, Gaster isn't forgiven nor saved. He fades out of existence after giving Papyrus and Sans their memories back.
Also, the whole future monster thing is gonna be cut out.
The timeline is right before the true ending but after Sans and Papyrus regain their memory.