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MIDI — MIDI Music File
MIDI files store music as notes and instruments instead of recorded sound; the computer or keyboard that plays them makes the sound.
A MIDI file holds no recorded sound. It stores notes: which instrument plays which note, when, how long and how loud. The computer or keyboard that plays it makes the sound, so the same file sounds different on different devices.
Many players and phones no longer play MIDI at all. Convert.Online renders MIDI with a General MIDI sound bank (FluidR3) into real audio, so the result sounds the same everywhere and can go to MP3, WAV, FLAC or OGG.