Lots of tools and hardware to bolt furnitures on top of each other so you can stack furniture safely.
I stacked furniture when I was living in a dorm room. Now I have an apartment I still stack furniture. It is a much more efficient use of space and my kitties love slepping on top of stacked furniture (when done safely). For example, I always stack a desk on top of another desk to use as a hutch. I also like to stack two or three dressers on top of each other. Dressers are awesome for all kinds of storage issues...not just for clothes!!!
Bed risers are deinitely a YES! Also, a day bed is better than a regular bed because you can use it as a sofa during the day. Futons are awful and uncomfortable.
Lots of hooks (again, storage issues)
TV and computer (I never had them until graduate school. I didn't know what I was missing)
A huge and easy-to-carry laundry basket.
A wastebasket. Again, I didn't have one until graduate school and I had no idea what I was missing. Now I have four
A translucent curtain for privacy and a curtain rod (so you can rise the mini-blinds up all the way. I personally hate mini-blinds)
Candles (if they are allowed)
Toaster or toaster oven (if they are allowed)
A VERY SHARP pair of scissors--they make life much easier!!!
I am still looking for some sound-dampening drapery for my apartment. You are a musician so you probably need it too.
Congraduations!!! What major are you going to study in?