SiIvaGunner Wiki
For the personification of the "Sans is Ness" meme, see Sens.

"sans." is a frequently ripped track from Undertale and Deltarune.


"sans.", titled "mus_muscle" in the game files,[1] is a track that plays in many locations throughout Undertale, mostly relating to the eponymous character: it plays during Sans' introduction in Snowdin Forest, in rooms containing his sentry stations, inside Grillby's, in Papyrus and Sans' house, and in Napstablook's snail farm. Its melody is also used as a leitmotif in "It's Raining Somewhere Else", a part of "Bring It In, Guys!", and the unused "Song That Might Play When You Fight Sans". The track was later reused in Deltarune, where it plays in Sans' convenience store in Hometown.

Toby Fox originally composed the song sometime in October 2012 for use in a project related to Homestuck, a webcomic he was a major contributor to.[2] It was originally titled "muscles.mp3", explaining the track's filename in Undertale.


See also: Category:sans.

The first rip of "sans.", "sans. - Undertale", was uploaded to the GiIvaSunner channel on March 28, 2016. After the GiIvaSunner Termination, the rip was reuploaded to the SiIvaGunner channel on May 2, 2016. As of September 22, 2021, this rip has garnered over 805 thousand views, making it the most viewed rip of "sans." on the channel.

There are currently 12 rips of this song on the channel, including "muscles (Unused) - Hiveswap", which references the song's original planned use in a Homestuck-related project.


  1. "sans." on the Undertale Wiki
  2. GitHub page containing "sans."; October 24, 2012
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General Meme: MeGaLoVania
Events Homestuck 11th Anniversary
Frequently ripped tracks MeGaLoVaniamuscles.mp3
Main series AlterniaboundOpenbound
Spin-offs Hiveswap (Act 2) • Hiveswap FriendsimPesterquest
Related Music featured: Undertale
Fan projects: UNDERTALE: Halloween Hack
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General Main article: Undertale
Memes: MegalovaniaSans is Ness
Characters: PapyrusSans (Sens) • Undyne
Events Good Night BreakUndertale 1st AnniversaryUndertale 5th AnniversaryUndertale 6th Anniversary
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Frequently ripped tracks Undertale: BonetrousleCOREDeath by GlamourFallen DownHis ThemeMEGALOVANIAMenuOnce Upon a Timesans.Snowdin Town
Deltarune: Smart Race
Main series Undertale
Spin-offs Deltarune
Related Fan projects: UnderveilUNDERTALE: Halloween Hack
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