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Originally Posted by murphyv310
Music in it's raw state (not passed through anything electronic) is full of all sorts of harmonics, without harmonics everything would just be sine waves without the colouration that you get from instruments acoustics (halls, rooms) etc!
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Mainly overtones, not harmonics. Halls/rooms mainly add reverberation and modify the frequency response, they don't add much in the way of harmonics. Unless the sound is really loud, air and building surfaces are reasonably linear.