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The phonograph was first invented in 1877 by Thomas Edison. Eventually up on  the market in 1896. The idea of at home music was absurd during the time,

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The translator radio was released in 1954. It was smaller and used batteries instead of a cord.

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Even smaller than radio, had start, stop, and rewind and fast forward buttons. Much more portable

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The CD player was much less portable but CDs were portable.

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The MP3 player was very portable, had a headphone jack, had a chargeable battery.

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The Apple iPod/iPhone series was IT. You could download any songs you wanted with the greatest of ease and play them anywhere.