MIDI (Musical Instrument Digital Interface) is a protocol that allows instruments, computers, and software to communicate with each other. Unlike audio files, MIDI doesn't contain sound — it contains musical data : which notes to play, how hard, and for how long. Why use MIDI? Flexibility — Change the instrument, tempo, or key of a MIDI file without losing quality. Creativity — Use professional-grade melodies, chord progressions, and drum patterns as a starting point for your own tracks. Speed — Skip hours of composing and focus on production, mixing, and arrangement. What's in a MIDI pack? MIDI packs on Sampleyard typically include melodies, basslines, chord progressions, and/or drum patterns — all organised by genre, mood, and key.