Update README with all six tracks

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

@@ -9,14 +9,15 @@ Each track is a `.py` file. Run it to hear it.
 1. **Raga Midnight** — D Phrygian (Bhairavi), shruti just intonation, 90 BPM. Tabla, sitar, tambura, dhol. Hand-written tabla solo with tihai cadence.
 2. **Culture Clash** — D minor, 95 BPM. Didgeridoo drone, Rhodes, tabla with fills, sitar arps, NES Mario theme, Hotline Bling on steel drum, theremin solo, marching snare military finale with DCI cadence. 808 sub bass throughout.
 3. **Chakra** — Root to crown frequency activation journey. Shruti tuning at A=432 Hz. Ukulele opening, singing bowls, harmonium, tambura, sitar, theremin. Metric modulation tempo changes (60 → 90 → 108 → 135 BPM) ascending through seven chakras.
+4. **Ghost Protocol** — F minor, 128 BPM. Portishead-style dark Rhodes intro with trip-hop beat, morphing into a Strobe-inspired hypnotic build. Saw arp emerges, kick doesn't arrive until bar 49. NES square wave melody at the emotional peak.
+5. **Acid Reign** — A minor, 140 BPM. Dual 303 acid bass lines (saw + square) with resonant filter sweeps (Q up to 20). Cajon in cathedral reverb, Rhodes pad, 808 sub. Five hand-written groove patterns.
+6. **Silk Road** — D minor, 95 BPM. A caravan picking up musicians along the ancient trade route. Koto solo (China) → sitar + tabla (India) → mandolin + doumbek (Persia) → guitar + cajon (Mediterranean) → all together. Nobody leaves, everyone adds their voice.
 
 ## Usage
 
 ```bash
 pip install pytheory
 python tracks/raga_midnight.py
-python tracks/culture_clash.py
-python tracks/chakra.py
 ```
 
 ## License