This weekend i had the sudden inclination to play my piano. as i put my fingers on the keys i played a middle c with my left thumb. then acting on instinct i played the next higher c with my left pointer finger. amazingly i found that these two notes sounded almost identical. i found it was because the higher note was one octave higher than the lower one. this also means in physics terms that the frequency of the higher note was two times larger than the lower note. then i took this one step further. i played both notes simultaneously and it produced a nice melodic blend of notes.
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