[Rubberducky1324]

> Also: 44.1kHz sampling rate != arbitrary waveform up to 22050Hz, unless music you're listening to consists of pure sine waves

Every signal can be represented as a combination of pure sine waves. That insight is the basis of Fournier analysis / transform.

[HPsquared]

It's also (pretty much) how sound is processed by the inner ear. The different little hairs each pick up different frequencies.