Musical Instrument Digital Interface (MIDI)

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Musical Instrument Digital Interface (MIDI) is a technical protocol that governs the interaction of digital instruments with computers and with each other. Instead of a direct musical sound representation, MIDI provides the information on how a musical sound is made with the help of MIDI commands. The protocol not only provides compactness but also provides ease in manipulation and modification of notes, along with a flexible choice of instruments.

Source: https://www.techopedia.com/definition/4508/musical-instrument-digital-interface-midi