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The natural minor scale can be thought of in two ways, the first is as the relative minor of the major scale, beginning on the sixth degree of the the scale and proceeding step by step through the same tetrachords to the first octave of the sixth degree. In solfege "La-Ti-Do-Re-Mi-Fa-So."
Alternately, the natural minor can be seen as a composite of two different tetrachords of the patter Whole-Half-Whole (Whole) Half-Whole-Whole. In solfege "Do-Re-Me-Fa-Sol-Le-Te-Do."
All of Western Harmony from the late Renaissance up to the early Twentieth Century is based upon these two objects and the unique relationships created by this system of organizing 7 notes.
The white keys on a piano correspond to the diatonic scale of C major (C-D-E-F-G-A-B-C), with the notes 1 whole tone apart, except for E-F and B-C, which is an interval of 1 semitone (half a tone).