Evolutionary accident, perhaps. We have been conditioning for millions of years to detect dangers and distinguish among sounds of nature. Obviously, the sounds

Evolutionary accident, perhaps. We have been conditioning for millions of years to detect dangers and distinguish among sounds of nature. Obviously, the sounds of bird songs and most of animal cries are in so-called major tonality, while sounds of nature like wind, raining, thunderstorm, etc. are belongs to minor. The swinging from one to another and variations on a theme are pleasant to us the way natural bright colors are more pleasant than dull ones. Rhythm is another main factor, and it probably has something to do with repetitive patterns of behavior, the physiological phenomena behind some trance states (which is related to sexual arousal that makes an animal numb) and rhythms found in sounds of nature. But, of course, it has nothing to do with harmonic series and other man-made concepts of the mind.