Add 3 composed MIDI tracks (midi_output)

- 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.
2026-04-17 22:32:46 +00:00
parent f19e3f0633
commit bc8df7f33b
7 changed files with 573 additions and 21 deletions
@@ -0,0 +1,115 @@
+#!/usr/bin/env python3
+"""
+Tronica - 90s Trance / EBM
+Driving hypnotic 90s trance with arpeggiated leads, wide choir pads,
+and propulsive rhythm. 138 BPM.
+
+Structure: 40 bars
+Intro  (4 bars) - sparse 16th-notes
+Build  (8 bars) - speed to 32nd-notes
+Drop   (8 bars) - full 32nd-notes
+Break  (8 bars) - back to 16th-notes
+Drop2  (8 bars) - full 32nd-notes
+Outro  (4 bars) - fade out
+
+Instruments:
+  T0: Lead 1 Synth   GM 80 - driving arpeggio
+  T1: Pad 4 Choir    GM 88 - sustained pads
+  T2: Drum set       Ch 10 - trance dance beat
+  T3: Lead 3 Synth   GM 84 - accent in drops
+"""
+from midiutil import MIDIFile
+
+BPM = 138
+PPQ = 960
+
+CHORDS = [
+    {"root": 48, "arp": (0, 3, 7, 12)},
+    {"root": 45, "arp": (0, 4, 7, 12)},
+    {"root": 50, "arp": (0, 4, 7, 12)},
+    {"root": 46, "arp": (0, 2, 7, 12)},
+]
+
+total_bars = 40
+fill_bars = {3, 11, 19, 27}
+
+def sp(v):
+    """Safe pitch: return only if 0-127."""
+    return v if 0 <= v < 128 else None
+
+# ========= Create MIDI File =========
+midi = MIDIFile(4, file_format=1, ticks_per_quarternote=PPQ)
+midi.addTempo(0, 0, BPM)
+midi.addProgramChange(0, 0, 0, 80)
+midi.addProgramChange(1, 0, 0, 88)
+midi.addProgramChange(3, 9, 0, 84)
+
+# ========= Track 0: Arpeggio =========
+for start, num, spd in [(0,4,4), (4,8,8), (12,8,8), (20,8,4), (28,8,8)]:
+    dt = 1.0 / spd
+    for bar in range(start, start + num):
+        chord = CHORDS[bar % 4]
+        r = chord["root"]
+        ints = chord["arp"]
+        for i in range(4 * spd):
+            p = sp(r + ints[i % 4] + (i // 4) * 12)
+            if p is not None:
+                v = 88 if i % 4 else 93
+                midi.addNote(0, 0, p, bar * 4 + i * dt, dt * 0.85, v)
+
+# Outro fade (4 bars, decrescendo)
+for bar in range(36, 40):
+    chord = CHORDS[bar % 4]
+    for i in range(4):
+        p = sp(chord["root"] + chord["arp"][i % 4])
+        if p is not None:
+            midi.addNote(0, 0, p, bar * 4 + i * 0.25, 0.2, max(35, 75 - (bar-36)*15))
+
+# ========= Track 1: Pads =========
+midi.addControllerEvent(1, 0, 0, 91, 75)   # Reverb
+midi.addControllerEvent(1, 0, 0, 93, 85)   # Chorus
+midi.addControllerEvent(1, 0, 0, 11, 127)  # Expression
+for bar in range(total_bars):
+    r = CHORDS[bar % 4]["root"]
+    for n in [r+7, r+12, r+19]:
+        midi.addNote(1, 0, n, bar*4, 3.9 if bar%2==0 else 3.7, 50)
+
+# ========= Track 2: Drums =========
+for bar in range(total_bars):
+    base = bar * 4
+    for beat in range(4):
+        bt = base + beat
+        midi.addNote(2, 9, 36, bt, 0.2, 115 if beat==0 else 105)
+        if beat in (1, 3):
+            midi.addNote(2, 9, 38, bt, 0.2, 110 if bar in fill_bars else 90)
+        midi.addNote(2, 9, 42, bt + 0.5, 0.1, 70)
+    if bar in fill_bars:
+        midi.addNote(2, 9, 46, base + 3.5, 0.3, 80)
+        midi.addNote(2, 9, 46, base + 3.75, 0.2, 75)
+
+# ========= Track 3: Lead Cues =========
+for bar in range(8):
+    bt = (12 + bar) * 4
+    r = CHORDS[(12 + bar) % 4]["root"]
+    for bp, off in [(0,12),(0.5,16),(1.0,19),(2.0,16),(2.5,19),(3.0,24)]:
+        midi.addNote(3, 9, r+off, bt+bp, 0.5, 90)
+for bar in range(8):
+    bt = (28 + bar) * 4
+    r = CHORDS[(28 + bar) % 4]["root"]
+    for bp, off in [(0,12),(0.5,16),(1.0,19),(2.0,16),(2.5,19),(3.0,24)]:
+        midi.addNote(3, 9, r+off, bt+bp, 0.5, 90)
+
+# Pitch bend
+for bar in range(8):
+    bt = (4 + bar) * 4
+    midi.addPitchWheelEvent(0, 0, bt, 3000 + bar*500)
+    midi.addPitchWheelEvent(0, 0, bt + 2, -(3000 + bar*500))
+
+# ========= Write =========
+output_file = "/home/paperclip/projects/gitea/pi-midi-zone/midi_output/tronica.mid"
+with open(output_file, "wb") as f:
+    midi.writeFile(f)
+
+print(f"Written: {output_file}")
+print(f"  4-track, {total_bars} bars at {BPM} BPM")
+print(f"  Style: 90s Trance / EBM")