>>103850197
I mean, he has made songs for Game Freak & Hololive, and did stuff with ZUN from Touhou and Smash Ultimate, so he is basically everywhere.
He did Dead Ma'am's Chest, which is what Biboo sang during the free part. I had to double check, it's been a while since I've watched it.
https://youtu.be/h4isKo0FDF8?t=2354