BDK did a crap ton of research and pretty sure they watch the classicals. All I knew is she does 3d renderings for the anatomy ( most character have really good anatomy cause she uses models as a base point and then goes from there). For the hands when theyre playing piano she traces over actual footage / replicates the movement. I don't really know their background in music but they did have a day job before fully committing. Don't know what that day job was though
She has a seperate blog where they post stuff consistently.
https://imbackingout.tistory.com/
They're in Korean so you're gonna have to use a translator.
No problem, I love their works and I ended up stumbling on their blogs. They have a unique work

I need to know everything about her.... ahhh.. she seems like someone studied music seriously.bplease tell everything you know about how she does it