In music, an octave range that is lower than the standard octave, often used in organ music and classical composition.
From 'contra-' (against, counter, below) + 'octave' (eight-note interval). Musical terminology developed to describe lower registers in organs and orchestral music.
Pipe organs have 'contra' stops that produce notes so deep they're below what human ears can clearly distinguish—you feel them more than hear them. Some frequencies literally vibrate your chest.
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