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The cassette tape was made in 1962 and was made by the Phillips company.

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Cassette tapes are made of polyester film with a magnetic coating which it uses to record music. Also there are motors in cassettes that runs against the tape with an electromagnet which reads the tape

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The Mp3 music file Was invented by Karlheinz Brandenburg in the  Early 90's.

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invented in 1877 by Thomas Edison,  Emile Berliner, and Eldridge R. Johnson, the phonograph was one of the first inventions that could replay music via records

The phonograph uses records to store and replay music. The records all have small pits/grooves which, when the needle (which is connected to a diaphragm) goes through the grooves, it causes the diaphragm to vibrate which creates sound

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Cassette tapes have good quality but if you don't want to listen to a certain song you have to put in a lot of labor

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Cassette tapes where popular music in the 1970s and 1980s. But the original cassette tape wasn't designed to play music.

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In august 1982 James Russell invented the compact disc.
The disc is rotated by a motor, the disc has groves in it that can not be seen by the human eye. A laser shines into a sensor and then that goes into the speakers and you hear music.

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Software reads the digital files and produces an electrical signal that is sent to the speakers. The speakers change the signal back into sound waves. Personal Mp3 players store and playback sound files in a similar way as  larger computers do. But they make it very easy to carry a lot of recordings with you.

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It can hold over 900 songs

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Thomas Edison, the same person who invented the light bulb, invented the phonograph (with assistance from other inventors)

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-good music
-not super bulky

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-lot of work
-cant run with them

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1. You can take them anywhere
2.  You can store lots of music on it

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1. The notes aren't the exact notes, they're a little off

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Mp3s have great quality only the music it plays doesn't sound the exact same as the original.

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Some mp3 players are made out of aluminum, steel, durable plastic, even magnesium

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They are made principally of injection-moulded polycarbonate.

They contain up to 680 megabytes of data

The music on a CD is imprinted in the form of pits of varying length on a spiral track 3.52 miles (5.66 kilometres) long.

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Best sound quality
Wont crash like mp3

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You can scratch them ruining the sound
You cant run with them because it wont work right