"Dogsong - Undertale" is a high quality rip of "Dogsong" from Undertale.
At 0:08, the rip turns into a recreation of the song "Levels" by Avicii using the Dog and Mario instruments from Mario Paint that are used in the advertised track.
This rip was originally uploaded to the GiIvaSunner channel on February 26, 2016, as "Annoying Dog - Undertale", and was then renamed to "Dogsong - Undertale" shortly after being uploaded. Following the GiIvaSunner Termination, the rip was reuploaded to SiIvaGunner on April 19.
- In sad news, Avicii died on April 20, 2018, which is two years (and a day) after the SiIvaGunner's reupload.