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moved keyboard image
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brynhughes committed Aug 24, 2014
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Expand Up @@ -7,12 +7,12 @@ title: Pitches and octave designations

The keyboard is great for helping you develop a visual, aural, and tactile understanding of music theory. On the illustration below, the *pitch-class* letter names are written on the keyboard.

![][keyboard]

### Enharmonic equivalence ###

Notice that some of the keys have two names. When two pitch classes share a key on the keyboard, they are said to have *enharmonic equivalence*. Theoretically, each key could have several names (the note C could also be considered Dbb, for instance), but it's usually not necessary to know more than two enharmonic spellings.

![][keyboard]

### Octave Designation ###

When specifying a particular pitch precisely, we also need to know the *register*. In fact, if all you have is C-sharp or B-flat, you do not have a *pitch*, you have a *pitch-class*. A pitch-class plus a register together designate a specific pitch.
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