From the analysis of harmonics, the concept of major chord is established. With 3 major chords, the major key is obtained, as well as its corresponding major scale. Then, the minor consonant chord is built in an artificial way. With 3 minor chords, the minor key is obtained, as well as its corresponding minor scale. The natural, harmonic and melodic minor scales are explained. It is also indicated which are the main chords in a key. The concept of consonance is one of the basic principles in Western music. Nuño Fernández, L. (2016). Chords and Keys. http://hdl.handle.net/10251/66749
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