Theoretical key
Musical concept / From Wikipedia, the free encyclopedia
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In music theory, a theoretical key is a key whose key signature has accidentals beyond single sharps and flats—that is, microtonal accidentals, double-flats (), or double-sharps ().
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Some musical keys are not normally used because they would require a double sharp or double flat in the key signature. For example, G♯ major requires eight sharps, and, since there are only seven scale tones, one tone requires a double sharp. The enharmonically equivalent key of A♭ only requires four flats, making it clearer to read.