‘I’ll just play for 12 to 15 minutes,” the composer and experimenter Chase Coley said, “and then I’ll take questions. People always have a lot of questions.” The scene was a square in Ramsgate for its annual festival of sound, with guitar wires strung from a piano at one end to a tree about 20 metres away. Coley covered his fingers in violin rosin (sticky resin) and walked up and down the wires, coaxing noises out of each one by stroking them; brass sounded different to steel, and none of it added up to a melody, exactly; it was more of an eerie soundscape. The piano acted as a resonator while the tree was playing itself, a tree. It’s called a........

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