First Maestro is Summoned because Ruby’s music summons the being responsible for its disappearance, and the Doctor realises he might be in a situation over his head. Do you remember how he got out of it or do you need to watch the The Devil’s Chord episode again.
Then the Beatles had to defeat Maestro. In these moments Maestro has the upper hand in their music battle against the Doctor and Ruby, so what do you think? Can Paul and John find the secret chord to banish them? Did they found it?
