Hello !

I put together a google doc which lists all of Ultimate's new tracks and features :
- their composers (when known) and arrangers
- their performers (when known)
- a few other tidbits

The main goal of this initiative was to repertoriate all of the game's performers since a lot of music in Ultimate was recorded using live instruments.
I was not able to find some of the composers and performers info so any help is appreciated (of course with sources) !

Some uncredited arrangers on this.

Grant Kirkhope - arranged "Spiral Mountain"
Toby Fox - arranged "MEGALOVANIA"
Atsuko Asahi - arranged "ARMS Grand Prix Official Theme Song" and "Ramen Bowl"

added all of those alongside a few others:
Junichi Nakatsuru, Yoshihito Yano and Yu Sugimoto are in the credits but not under arrangers, despite being credited in the sound test for arrangements in the base game.
Keisuke Ito is not mentioned in the credits at all, but is credited for Galeem and Dharkon in the sound test.
Mitsuhiro Kitadani and Yuji Masubuchi didn't appear in the base game, but are credited in the sound test for arrangements added as part of the DLC.

Can we add releases for the major version updates here? Would be easy enough to do thanks to the handy blog.
https://www.smashbros.com/en_US/blog/index.html
https://www.smashbros.com/ja_JP/blog/index.html

Oh and there's Smashwiki's documentation
https://www.ssbwiki.com/List_of_updates_(SSBU)

It would be better for cataloguing the new arrangers for the DLC at their appropriate times, so arrangers like Kitadani, Masubuchi, Kirkhope, Fox and Asahi don't have their game contributions out of order, and recurring arrangers get more coverage.

Example

Super Smash Bros. Ultimate Ver. 2.0
大乱闘スマッシュブラザーズ SPECIAL ver.2.0
Dairantou Smash Brothers SPECIAL ver.2.0
-April 17th, 2019

Music Arrangement: ACE (TOMOri Kudo / CHiCO), Yusuke Yamauchi, Mitsuhiro Kitadani
Added the Persona universe with the fighter Joker and the stage Mementos.
Could always have a song-by-song list linked with each arranger, dunno. Plus featuring the instrumemalists as Mentalo documented up there.