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The number at the left of each line represents the octave that the notes represented on the line are located in. Though this arrangement may at first seem to bear no resemblance to the black and white keys of a keyboard, piano tabs actually represent different regions on the keyboard through clever shorthand.
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Piano tabs usually take the form of a series of horizontal lines, each labeled with a number at its far left, like this: Break the keyboard into octaves which correspond to lines on the tab.
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