We have Beethoven to thank for how much music a CD could hold when it was first released.The CD was intended to be just 11.5 centimetres in diameter, but when Philips teamed up with Sony to release the compact disc and player, Sony was adamant that a compact disc had to have enough space to hold Beethoven’s Ninth Symphony (about 74 minutes). In order to do so, the size of the disc had to be increased to 12 centimetres in diameter instead.
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