MIDI files do not contain recorded audio; they contain instructions—note-on/off events, velocity, pitch bend, control changes, and program changes. A high-quality MIDI file is one that accurately reproduces the musical intent of a piece, including dynamic variation, proper instrumentation (General MIDI or specialized sound libraries), and nuanced timing. For educators, cover artists, and game developers, access to free, well-crafted MIDI data lowers the barrier to music production.