MIDI is an acronym standing for Musical Instrument Digital Interface. Unlike WAV files which tell the sound card what to output to the speakers, MIDI tells the sound card how to make the sound to send to the speakers. MIDI relies on a sound card with a special chip that creates an organ sound from a frequency. Because of this process MIDI files are very small. A typical WAV file of a 5 minute song may end up 20 Megabytes in size. Today you can get a file under 100 kilobytes of that same song. That's a 200 to 1 ratio. The only problem with MIDI is that the sound is digitalized when you play it so you're not keeping the recording quality of a WAV file.
Yes, we have the appropriate MIME types setup for full MIDI file support.
You can either use .midi or .mid extensions for your MIDI files.
Generally no, because of the conversion of frequencies versus the actual music, there are usually no copyright issues attached to MIDI files.
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