When I play music I‘ve noticed something that happens time after time. Immediately after the plant music device is connected to the plant, it will start to play notes running up and down the scale at a more or less constant tempo. After a time, which varies from an hour or two to several weeks – depending on the hour, the place and the disposition of the person who is interacting with it – the plant realizes that it’s producing the sound by itself, and modifies the melody creating increasingly complex harmonic structures. To verify this behaviour, we had a plant listen to the same piece of classical music for several days while it was connected to one of our devices. After a few days, the plant would follow the melody, harmonizing to perfection with the classical music. When I take an already ‘trained’ plant with me and let it play music with the device for a couple of hours surrounded by the other plants on the premises, each connected to a device, the others learn much more quickly. Using this method, two or more plants can then play at the same time, harmoniously and in tune.