pi-agent
bc8df7f33b
- midnight_drive.mid: 90s House/Dance at 128 BPM (75s, 5-track) Arpeggiated synth lead, driving bass, pads, brass stabs, dance beat - starlit_conversation.mid: 90s Slow Jam/Love Song at 88 BPM (99s, 4-track) Rhodes electric piano, strings, choir pads, soft drum groove - tronica.mid: 90s Trance/EBM at 138 BPM (69s, 4-track) Multi-section arpeggiated lead, wide pads, trance beat, accent lead Each .mid has a corresponding .py source showing how to compose it with MIDIUtil.
116 lines
3.6 KiB
Python
116 lines
3.6 KiB
Python
#!/usr/bin/env python3
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"""
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Tronica - 90s Trance / EBM
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Driving hypnotic 90s trance with arpeggiated leads, wide choir pads,
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and propulsive rhythm. 138 BPM.
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Structure: 40 bars
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Intro (4 bars) - sparse 16th-notes
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Build (8 bars) - speed to 32nd-notes
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Drop (8 bars) - full 32nd-notes
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Break (8 bars) - back to 16th-notes
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Drop2 (8 bars) - full 32nd-notes
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Outro (4 bars) - fade out
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Instruments:
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T0: Lead 1 Synth GM 80 - driving arpeggio
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T1: Pad 4 Choir GM 88 - sustained pads
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T2: Drum set Ch 10 - trance dance beat
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T3: Lead 3 Synth GM 84 - accent in drops
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"""
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from midiutil import MIDIFile
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BPM = 138
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PPQ = 960
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CHORDS = [
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{"root": 48, "arp": (0, 3, 7, 12)},
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{"root": 45, "arp": (0, 4, 7, 12)},
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{"root": 50, "arp": (0, 4, 7, 12)},
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{"root": 46, "arp": (0, 2, 7, 12)},
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]
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total_bars = 40
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fill_bars = {3, 11, 19, 27}
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def sp(v):
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"""Safe pitch: return only if 0-127."""
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return v if 0 <= v < 128 else None
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# ========= Create MIDI File =========
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midi = MIDIFile(4, file_format=1, ticks_per_quarternote=PPQ)
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midi.addTempo(0, 0, BPM)
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midi.addProgramChange(0, 0, 0, 80)
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midi.addProgramChange(1, 0, 0, 88)
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midi.addProgramChange(3, 9, 0, 84)
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# ========= Track 0: Arpeggio =========
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for start, num, spd in [(0,4,4), (4,8,8), (12,8,8), (20,8,4), (28,8,8)]:
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dt = 1.0 / spd
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for bar in range(start, start + num):
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chord = CHORDS[bar % 4]
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r = chord["root"]
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ints = chord["arp"]
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for i in range(4 * spd):
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p = sp(r + ints[i % 4] + (i // 4) * 12)
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if p is not None:
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v = 88 if i % 4 else 93
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midi.addNote(0, 0, p, bar * 4 + i * dt, dt * 0.85, v)
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# Outro fade (4 bars, decrescendo)
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for bar in range(36, 40):
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chord = CHORDS[bar % 4]
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for i in range(4):
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p = sp(chord["root"] + chord["arp"][i % 4])
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if p is not None:
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midi.addNote(0, 0, p, bar * 4 + i * 0.25, 0.2, max(35, 75 - (bar-36)*15))
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# ========= Track 1: Pads =========
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midi.addControllerEvent(1, 0, 0, 91, 75) # Reverb
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midi.addControllerEvent(1, 0, 0, 93, 85) # Chorus
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midi.addControllerEvent(1, 0, 0, 11, 127) # Expression
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for bar in range(total_bars):
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r = CHORDS[bar % 4]["root"]
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for n in [r+7, r+12, r+19]:
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midi.addNote(1, 0, n, bar*4, 3.9 if bar%2==0 else 3.7, 50)
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# ========= Track 2: Drums =========
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for bar in range(total_bars):
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base = bar * 4
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for beat in range(4):
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bt = base + beat
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midi.addNote(2, 9, 36, bt, 0.2, 115 if beat==0 else 105)
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if beat in (1, 3):
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midi.addNote(2, 9, 38, bt, 0.2, 110 if bar in fill_bars else 90)
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midi.addNote(2, 9, 42, bt + 0.5, 0.1, 70)
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if bar in fill_bars:
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midi.addNote(2, 9, 46, base + 3.5, 0.3, 80)
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midi.addNote(2, 9, 46, base + 3.75, 0.2, 75)
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# ========= Track 3: Lead Cues =========
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for bar in range(8):
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bt = (12 + bar) * 4
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r = CHORDS[(12 + bar) % 4]["root"]
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for bp, off in [(0,12),(0.5,16),(1.0,19),(2.0,16),(2.5,19),(3.0,24)]:
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midi.addNote(3, 9, r+off, bt+bp, 0.5, 90)
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for bar in range(8):
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bt = (28 + bar) * 4
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r = CHORDS[(28 + bar) % 4]["root"]
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for bp, off in [(0,12),(0.5,16),(1.0,19),(2.0,16),(2.5,19),(3.0,24)]:
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midi.addNote(3, 9, r+off, bt+bp, 0.5, 90)
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# Pitch bend
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for bar in range(8):
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bt = (4 + bar) * 4
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midi.addPitchWheelEvent(0, 0, bt, 3000 + bar*500)
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midi.addPitchWheelEvent(0, 0, bt + 2, -(3000 + bar*500))
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# ========= Write =========
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output_file = "/home/paperclip/projects/gitea/pi-midi-zone/midi_output/tronica.mid"
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with open(output_file, "wb") as f:
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midi.writeFile(f)
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print(f"Written: {output_file}")
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print(f" 4-track, {total_bars} bars at {BPM} BPM")
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print(f" Style: 90s Trance / EBM")
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