Waves of different frequencies can be superimposed together, like [this.](https://www.pitt.edu/~jdnorton/teaching/HPS_0410/chapters/quantum_theory_waves/waves_added.gif)
Your ears and brain are very good at hearing a complex waveform which is the superimposed sum of hundreds or even thousands of different simple waves like those, and picking it apart into all its components to figure out what they are and how they fit with each other.
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