Not mine, you can find the full song here: https://www.youtube.com/watch?v=hZ_H-_NI4SU
Maker: Toby Fox
Game: Undertale
Please contact me if you would like to use this in a project. We can discuss the details.
* Contains third-party samples.
Excercise caution when using it, refer to author comments / contact the author for details.