The electric piano in studios B/C is acting strangely. It looks like you need to hold down the power button in order to play music. I saw teachers yesterday tag-teaming the effort, with one person holding the button and the other playing the keys, and they expressed it had been like this for some time.
We might be able to bring up the piano from the theater or studio A if this is not something we have an easy/inexpensive fix for.