As I peer out from stages around the country looking at audiences, I often wonder what is going through their heads. Are they enjoying themselves? Are they being moved or entertained? Were they dragged to the concert by a partner and would prefer to be at home in front of the new series of Game of Thrones?

Wouldn’t it be great to wire an entire audience up to an EEG machine and capture the brainwaves inspired by a Beethoven quartet...

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