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frequency

How many times per second something vibrates. In sound, faster means higher.

How many times per second something vibrates, measured in hertz. In sound, higher frequency is higher pitch: 110 vibrations a second is the note A, and doubling to 220 gives the A an octave up. Every note is a number, and that number is its frequency.

Learn it: What is a note · The math behind music

The one-sentence definition at the top is the same one the Theory Aide extension shows as a tooltip inside Ableton Live. Hover any dotted term for its own.