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Music theory is a simple matter, but the books complicate the subject. Why is that? First of all, know that music theory teaching stopped in time. The didactic of the books is still very similar to the teaching of the last century; few contents were written in a modern language, simple and direct. The other problem is the lack of connection between the subjects. For example, an article discusses the major scale, another talks about the melodic minor scale, and another talks about the whole tone scale, but none of them shows the relationship between this concepts. Why are there different scales?
In music , harmony is the process by which the composition of individual sounds, or superpositions of sounds, is analysed by hearing. Usually, this means simultaneously occurring frequencies , pitches tones , notes , or chords. The study of harmony involves chords and their construction and chord progressions and the principles of connection that govern them. Harmony is often said to refer to the "vertical" aspect of music, as distinguished from melodic line , or the "horizontal" aspect. Counterpoint , which refers to the relationship between melodic lines, and polyphony , which refers to the simultaneous sounding of separate independent voices, are thus sometimes distinguished from harmony.