Smash his oboe
From Create Your Own Story
You take his multi-thousand dollar oboe and repeatedly smash it on the floor. As you keep smashing it, you can just barely make out the Mozart Oboe Concerto escaping from the broken bore of the oboe. It sounds like it's been trapped in there since 2006 when he won the job here. For some reason, hearing the Mozart Oboe Concerto is really bothering the flutes in particular.
Now Liang Wang has no oboe.