Periodic System
An alternative version of keyboard tablature (though less frequently seen) is based on a periodic system of numbers, like most modern tablatures, although incorporating negative and positive numbers assigned to the clefs (as positive for treble, and negative for bass). This particular method uses the middle C as the reference point. Unlike many tab forms the keyboard tab has far different placement values, meaning, regardless of the arrangement of the numbers it can still have the same value, but is displayed differently.
Read more about this topic: Keyboard Tablature
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