Midnight 12 I don't know which floor is playing the piano. What should I do?

It seems that every community has several such exceptions. If such a thing happens, only the property can be notified. Otherwise, you can only get up early layer by layer, but it is best to find several columns together. You can also post notices in conspicuous places in the building to remind the pianist to pay attention to the influence. If not, go to the property to solve it.