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You have a MIDI file — but it's not an audio recording. MIDI contains musical instructions: which notes to play, when to play them, how hard to press, which channel, which program change. Think of it as sheet music for computers. A MIDI file of Beethoven's 5th is under 50 KB. The same piece as WAV would be 300 MB.
MIDI (Musical Instrument Digital Interface) was standardised in 1983 so that synthesizers from different manufacturers could talk to each other. The protocol hasn't fundamentally changed since — a testament to getting the design right the first time. MIDI 2.0 arrived in 2020 with higher resolution, but the original spec still powers music production, live performance, DJ controllers, lighting rigs, and video game scores worldwide.
Every OS plays MIDI through built-in synthesizers (the quality varies wildly). GarageBand, Logic, Ableton, FL Studio, and every DAW imports MIDI for editing and re-instrumentation. For better playback quality, load the MIDI into a DAW and assign proper virtual instruments. The magic of MIDI is that you can change the tempo, key, and instrumentation without affecting quality — because there's no audio to degrade.