Random riff generation is fun! Humans can't be truly random, so this lesson lets the number pi choose the rhythm instead. Here's how it works:

Take Pi in hexadecimal (base 16) to get a string of characters, with each character representing one of 16 different rhythm patterns from the previous lesson.

The result is disjointed, but a steady 4/4 drum part underneath glues it together. A couple of deliberate choices (palm mutes, choosing when to switch between notes, a Byzantine-scale lead) turn chaos into groove.

What is the Byzantine scale? It's also called Double Harmonic Major, and it's a Phrygian Dominant scale with a major 7th. It's an exotic and dark sound, a favorite for mystical-sounding music.

This all demonstrates how to write math-metal grooves with basic rules, and still add your own influence to things.