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Thomas Edison invented the "Talking Machine" called the phonograph.
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The person who invented the stereo was named Alan Bluemlein
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The Philips Company released the first compact audio cassette
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8 track tapes became popular device
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The cassete tapes and compact discs replaced the phonograph.
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I think that stereo systmes will be little tiny things that can fit in your pocket. I also think that you can listen to without headphones but only you can hear it. I think that because stereo systems keep getting smaller and more popular