CD's according to the article we read for today, "Music in the Age of Free Distribution: MP3 and Society", mentioned that CD's and older formats of music reproduction produced sound using bumps and grooves.
The first thing I thought of was something not mentioned in the article that used this method: music boxes. My mom is a fan of antique's, and she once showed me how music boxes produced sound. There are little holes in music boxes placed at increments that would produce sound. The closer the holes are to each other, the more sound that is produced faster (like eighth or sixteenth notes).
Magic keyboards that play music on its own when you put a coin in also uses this method.
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