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When you play two notes a wide interval apart on the piano - like a 5th, you hear two distinct pitches. But if you play two notes really close to each other - having a frequency of less than about 30 Hz between them, like a semitone - then we don’t hear two distinct pitches. Instead we hear the a single note at the average frequency, but with a volume which goes up and down over time. This variance in volume is called a ‘beat’ - and creates a ‘wah-wah-wah’ sound. And these beats happen at the difference in frequencies between the notes.