Musicians created MIDI because there was a need to synthesize musical instrument sounds, and the only way that was possible was digitally. As far as how they're used, much like MP3s and RealAudio, MIDI files are nothing more that compressed music files that don't take up too much space on a disk, and are easy to download. The whole MIDI issue was never created for computers. It just so happened that they became very popular music files that people can easily access from web sites. Please let us know.
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