Spooktune
oh... a classic spooktune... they don't make songs like this anymore...
Spooktune is the 38th track in the UNDERTALE Soundtrack. It is in the first CD found in Napstablook's house. The song continues playing after exiting their house. This (as well as Spookwave and Ghouliday) can trigger an event where the protagonist encounters Aaron and Woshua, who are too scared to fight due to the spooky music. It consists of a single sample.
The track's game data filename is "mus_spoopy", a reference to the meme of intentionally misspelling "spooky" as "spoopy".
The Hiveswap official soundtrack, another Toby Fox work, has a track titled B-SIDE - SPOOKTUNE, a remix of this track.
In Deltarune, both A DARK ZONE and Cutie Mew Mew Magic incorporate Spooktune's melody into their track.
- If the protagonist decides not to play Spooktune when given the opportunity, the narration says that "Spooktunes are dead."