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MIDI (/ËmÉªdi/ ; short for Musical Instrument Digital Interface) is a technical standard that describes a protocol, digital interface and connectors and allows a wide variety of electronic musical instruments, computers and other related devices to connect and communicate with one another.hese messages are sent via a MIDI cable to other devices where they control sound generation and other features. This data can also be recorded into a hardware or software device called a sequencer, which can be used to edit the data and to play it back at a later time.
MIDI is nothing more than data -- a set of instructions. MIDI data contains a list of events or messages that tell an electronic device (musical instrument, computer sound card, cell phone, et cetera) how to generate a certain sound.Here are a few examples of typical MIDI messages:1  Note On signals that a key has been pressed or a note on another instrument (like a MIDI guitar or clarinet) has been played. 2  The Note On message includes instructions for what key was pressed and at what velocity (how hard the note was played).nd since MIDI files don't contain sampled audio like MP3 or WAV files, they're comparatively much smaller than audio files. A minute of compressed audio adds up to around 10Mb (megabytes) of data, while a minute of sound translated into MIDI only takes up 10Kb (kilobytes) [source: MIDI Manufacturers Association ].