It should not be possible. . If you know your classmates, you may be able to sneak into the big classes, but generally speaking, the classes at the conservatory, especially the professional classes, are small classes, one-on-one with the teacher, so you can just sit in on them. The location of the Conservatory of Music is at the east gate of the Central Campus of Qingdao University. Go up the slope on the left to the first building. It's called Deya Building. Walking to the left after entering the door is the piano room. Outsiders are not allowed to enter.