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In 1906 the Victrola model of the record player was introduced by RCA Victor, leading to mass production of music on records to be played invidually.
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The 8 Track or Stereo 8 was released by a collaboration of large businesses, Ford, GM and RCA Victor Records. They had the capabilities to place players inside cars.
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In November, 1964, Cassettes were released in the US not long after introducing 8 tracks. They were smaller but lacked the quality of the 8 track, however their ability to rewound made them more popular.
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In September, 1976, Sony first publicly demonstrated an optical digital audio disc.
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In 1979 the Walkman was first released by Sony in Japan, making the experience of listening to music personal and portable.
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The CD Walkman or Discman, as it was called, was released in 1984. Although portability was still desired, the perpetually disc skipping while moving made it a rather cumbersome product.
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The IPod was released by Apple, allowing consumers to take their music with them as digital files, eliminating many of the previous hazards of portable music devices.
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The first iPhone is released, allowing consumers to merge the convenience of the iPod with their cell phone.
