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Drumming with L-Systems

Josh Parnell. Drumming with L-Systems. Lindenmayer Systems. Type of Grammar Example: A -> BC B -> ABA C -> CA. Objectives. Variability in Output Coherence Emphasize important, regular beats Flexibility Time signature Beat emphasis. Methodology. L-System describes behavior of hits

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Drumming with L-Systems

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  1. Josh Parnell Drumming with L-Systems

  2. Lindenmayer Systems • Type of Grammar • Example: • A -> BC • B -> ABA • C -> CA

  3. Objectives • Variability in Output • Coherence • Emphasize important, regular beats • Flexibility • Time signature • Beat emphasis

  4. Methodology • L-System describes behavior of hits • Hits comprise one or more drum pads played within a small period of time • Hits have three distinct meanings based on beat emphasis • Map L-system hits to musical events based on beat emphasis

  5. Methodology (Visual) Hit Stream Beat Class Stream 1 2 1 2 3 3 1 2 1 2 5 3 3 … 2 0 0 0 1 0 0 0 2 0 0 0 … Pattern Generator Output

  6. L-System Representation

  7. Limitations – Future Possibilities • Single L-system • Drum pads are treated in groups rather than separately • True polyrhythmsnot possible • L-system unaware of time • Must rely on contextual hits • No fills or transitional patterns

  8. A Peek at the Code

  9. Output: 4/4

  10. Output: 6/8

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