Josephine Livingston: “The effect is extraordinary. It’s polyphony, but you, the listener, control what you hear. Curious about how the music melds with the music further down the park? Just keep walking. Captivated by a particular passage? Stay where you are. Dynamics in sound become dimensions in space. You’re so close to the singers that it’s awkward. Look them in the eye or look at your feet: It’s your choice. … In The Mile Long Opera, there are as many operas as there are listeners, because it changes according to your position in space and your frame of mind. It exists to the extent that one is tuning in.”