+**12ed** is a common abbreviation for [twelve-tone equal temperament](/wiki/twelve-tone_equal_temperament). This fundamental [tuning system](/wiki/tuning_system) divides the octave into twelve logarithmically equal semitones. It forms the basis of most Western music, allowing instruments to play consistently in any key.
+## See also
+- [Equal Temperament](/wiki/equal_temperament)
+- [Octave](/wiki/octave)
+- [Semitone](/wiki/semitone)
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