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cd's have a certian amount of megabites they will hold. An MP3 takes a file and compounds it into a very small compounded file which also makes sound quality drop off the charts. A normal cd will hold 700mb worth of memory. You can put 70 one minute long songs, or 2 songs that are 35 minutes long on it. The MP3 files are chopped so the song is only partialy there. Its just that the human ear cannot identify that parts are missing, it only detects a crappy audio recording.
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