how the fuck do you hide folders not trying to have a bunch of folders on the main screen
Go into Finder... open new finder window
This view is your friend. Its going to take a sec for you figure out how to get around, but basically the left bar is where your going to customize where you organize your files, and drives.
Make it easy, and just start dragging everything into music - should be preset there or create a new folder in the screen where its says 'your name imac' or whatever.... then drag that folder to the left bar if you want.
I have 2 drives in my macbook, and one I partitioned in half, and that glitchard is a external drive on the wifi. Go to folders you use a lot, just drag to the favorites so you dont have to always click for them.