Recording Connection DJ Program Lesson 4 will teach you about MIDI in Ableton Live. What is MIDI? It stands for Musical Instrument Digital Interface. Officially born in 1983, it is a protocol and does not contain audio. It works by telling sound generating devices (synths, samplers, etc.) how to generate sounds. Highly flexible, MIDI does not take up a lot of space on your hard drive and makes editing and changing performances and sounds easy. Although it can be frustrating for new users at first, MIDI is your friend. Be patient with MIDI.