Music makes the people come together...
According to my textbook for music class, all cultures use some kind of "octave" duplication. However, in Chinese music the octave is divided into five separate pitches, rather than our seven, and some Turkish and Arabic melodies make use of fourteen.

One question I had: the book also stated the obvious in describing major keys as happier-sounding than the more ominous or mournful minor keys. What I want to know is, why is it that way? Is there something about the mathematics of the minor key that makes it feel negative to us? I'm sure somebody has studied this.