where I can find different kinds of flutes, typical chinese instruments, etc. in Xian?

Hello. I am going to Xian for the first time. I am a musician and would like to find a good instrument shop where I can find different kinds of flutes, typical chinese instruments, etc. Can anyone help me with that?
I heard from some friends that Xian has a music university then I believe that there should be many music instruments too.
Thanks in advance,
Renato