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Twelve-tone equal temperament

musical tuning system that divides an octave into 12 evenly-spaced frequencies on a logarithmic scale

Pronunciation
/twɛlv - təʊn ˈiːkwəl ˈtɛmpərəmənt/
/twɛlv - toʊn ˈikwəl ˈtɛmpərəmənt/