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1877 - Edison's Cylinder Phonograph was a way to play music, and it was major because prior to this being invented, the only way to listen to music was by witnessing it in person.

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1886 - Radio was important because it allowed stations to enter families' homes so they can hear radio stations, interviews, talk shows, music and much more live. It was a step forward from the Phonograph because you could witness many different stations live.

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1897 - Vinyl records were an improvement from the radio stage because the audio quality was a major increase from the radio.

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1962 - Cassettes were an improvement from vinyl records because they brought the audio quality found in a vinyl LP to a portable size that you can take anywhere.

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1965 - The 8-Track was an improvement of the Cassette because you did not have to flip over the cartridge to play remaining tracks from a certain side.

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1982 - CDs were a huge step forward from the 8-Track because they were cheaper, easier to collect, higher quality and more widely available to purchase.

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1992 - The MiniDisc was an improvement from CDs because it was a much more Compact way to play CDs, as the discs were much more portable and smaller.

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1993 - Music streaming is an improvement from the previous stage because it allowed people to stream music on demand anytime they want to, and any song they want to without limits.