If you watch Gamegrumps you can find their second channel which has music in it. Dan sings and possibly Arin is involved with the animation. I dunno, but i do know that the frill haired man sings the song in this video you linked.

I appreciate the watch. Thank you. Hope you have been safe during this covid-19 situation

yeah i'm being very safe during the covid-19 i always go places with a mask since they require them indoors

Thanks for the link.