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nute. Most people find that very soothing, and, interestingly, 12 cycles per minute is roughly the frequency of the breathing of a sleeping human. There is a deep resonance with being at rest. We also associate it with being stressfree and on holiday. The second way in which sound affects you is psychological. Music is the most powerful form of sound that we know that affects our emotional state. (Albinonis Adagio) This is guaranteed to make most of you feel pretty sad if I leave it on. Music is not the only kind of sound, however, which affects your emotions. Natural sound can do that too. Birdsong, for example, is a sound which most people find reassuring. (Birds chirping) There is a reason for that. Over hundreds of thousands of years weve learned that when the birds are singing, things are safe. Its when they stop you need to be worried. The third way in which sound affects you is cognitively. You cant understand two people talking at once (If your