How does a needle lightly rotating over grooves create a sound frequency of a specific song?
In: Other
All sounds are vibrating waves in the air, or another medium if you are for example underwater. When you add up all these different waves together (the waves from the singer plus the waves from the guitar plus the waves of the bass etc.) you get another wavey function that looks quite messy, but is still fundamentally just a bunch of waves. The grooves in the vinyl match this wavey function and make the needle vibrate in the same way that the recording has all those waves added up. That way you effectively hear all the frequencies from all the instruments at the same time.
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