So this is basically a copy of Sheet Music Boss's cover of Undertale from the game Undertale. The original was written by Toby Fox, creator of the game Undertale. Sheet Music Boss did this really touching cover because an Undertale fan passed away due to bone cancer. His name was Chris Taylor. So after he passed away, his friends asked Sheet Music Boss make a cover to honor him. The YouTube video explains it a lot better. So this is just a cover of that cover. It's basically the same thing except I made it a little easier to play because I have small hands. Go check out Sheet Music Boss's video, too. It's really moving.