Finally, the menu theme in high quality is available on Soundcloud!
If you want use ToukenKamui song please: 
Ask and credit ToukenKamui\刀剣神居Undertale AU! 
Don’t steal his song,PLS!

《Credit》

~AU~

Undertale by Toby Fox
Murder time trio by ToukenKamui
Dusttale by Ask-Dusttale
Killer!sans by Rahafwabas
Horrortale by Sour-Apple Studios


~Ieitmotifs~

"Once Upon a Time", "MEGALOVANIA", "Core"  by Toby Fox

~Sprites~

Murder time trio sprite by IsRei
DeviantArt Link:
https://www.deviantart.com/isrei/art/Murder-Time-Trio-v2-815362992
edit based on 刀剣神居Undertale AU edits.

[MURDER TIME TRIO] OST - 001: "MAIN MENU" (Menu Theme)

I like Godzilla, because who doesn't like giant monsters??? Looking at you, film critics...

With that out of the way... hi! I'm Garzillathehedgehog. I like Godzilla, Clock Tower, UNDERTALE, Garfield... a lotta things! I can also do spriteart, and I hope I'm able to create music one day. But, for the time being, I'm an UNDERTALE re-uploader.

Finally, the real SOUNDCLOUD page dedicated to the full soundtrack to the MURDER TIME TRIO project is here.
If you use ToukenKamui song please credit ToukenKamui\刀剣神居Undertale AU! 
Don’t steal his song,PLS!
Murder time trio / Music by 刀剣神居Undertale AU (ToukenKamui)

《Credit》

Undertale by Toby Fox

~刀剣神居Undertale AU~
Original video: https://www.youtube.com/watch?v=_DgCNK1Sv7E&t=32s

~Sprites~
Sans sprite by IsRei
DeviantArt Link:
https://www.deviantart.com/isrei/art/sans-v6-815241236

~AU~

Murder time trio by ToukenKamui
Dusttale by Ask-Dusttale
Killer!sans by Rahafwabas
Horrortale by Sour-Apple Studios
Insanity sans by Hdlegend Killer-DJ
Satsujin!sans (Murder time trio) by 刀剣神居Undertale AU

[MURDER TIME TRIO] OST - 001: "MAIN MENU" (Menu Theme)

MURDER TIME TRIO FULL OST