Eric Prydz Opus Midi ((free)) <Top-Rated>
The iconic moment in Opus is when the 16th-note arpeggio enters. Create a secondary MIDI track using the same chords but arpeggiated upwards. Use a MIDI effect (like Ableton's Arpeggiator set to "Up" with a rate of 1/16th) or manually draw the notes. The contrast between the slow chord pad and the fast arpeggio is what creates euphoria.
The "Opus" lead is a repetitive arpeggio that shifts notes over a steady rhythmic bed. eric prydz opus midi