The MIDI file for "Opus" is a masterclass in minimalist composition achieving maximalist impact. On a visual level, the MIDI data looks deceptively simple—almost boring. However, the genius of the file lies in how it interacts with synthesis parameters to create one of the most emotionally charged progressive house tracks in history.
The Core Hook: The MIDI consists of a repeating 8-bar chord progression. The theoretical foundation is straightforward:
The "Boredom" Factor: If you open the MIDI in a piano roll, you will see the same block of notes repeating for nearly 9 minutes. To an untrained eye, it looks like a lazy loop. To a producer, it represents restraint. The MIDI provides the skeleton; the song relies entirely on the "meat" (synthesis and filters) to create the journey. eric prydz opus midi
The Breakdown Arpeggio: During the breakdown, the MIDI shifts from block chords to a rolling, rhythmic pattern (often grouped in 3s against the 4/4 beat). This MIDI data is critical. It creates the "rising" sensation. The notes aren't changing, but the rhythmic subdivision is, which tricks the brain into hearing movement where there is stasis.
Throughout the track, a gentle arpeggio plays the same chord tones in a high octave (C6–C7). The MIDI file for "Opus" is a masterclass
Arpeggio pattern (16th notes, upward then downward):
Chord: Fm
Notes: C6, Eb6, F6, Ab6, C7, Ab6, F6, Eb6 (repeat)
MIDI channel: Separate from lead, low velocity (50–60), high-pass filtered. The Core Hook: The MIDI consists of a
Pad chords: Same progression, played as whole notes in strings/pads (octave C4–C5), fading in/out with long attack/release.