An Underfell-esque take on Cacophonovania ~ Lullaby of Vengance, a song for an Undertale AU that got cancelled a while back. Curiously, this and the 2 other songs for the AU got deleted from SoundCloud entirely rather than merely being labeled as "orphaned".
I asked the AU's owner could upload this track on SC, but he never got back to me for whatever reason, so here it is on Instaudio instead.