The Sound of the Swarm and the Limits of Granular Synthesis

A VAN Magazine essay published this week revisits David Rothenberg's Bug Music — his investigation into the proposition that human rhythm did not originate in the composer's imagination but in the insect chorus that surrounded our species across millions of years of evolution. The argument is more unsettling than it first appears.

Rothenberg's central claim is precise: that rhythm, synchronisation, and dance in human music derive not from individual creative intelligence but from immersion in insect soundscapes so ancient and ubiquitous that we stopped hearing them. The 17-year cicada cycle — the slowest synchronised beat in the animal world, a pulse so extended it marks the phases of a human life — is his primary exhibit. When the Magicicada broods emerge in the northeastern United States, millions of individuals produce a collective drone of such mathematical precision that those who witness it compare the experience to a solar eclipse. No conductor. No score. No composer.

Iannis Xenakis understood this before Rothenberg named it. The Greek-French architect-composer who invented stochastic music — composition governed by mathematical probability rather than melodic intention — identified the cicada chorus explicitly as one of the two natural phenomena that gave him his conceptual model. Thousands of isolated sounds coalescing into a mass event with its own shape and internal architecture: that is Pithoprakta (1956). The insects were there first. Xenakis simply formalised the mathematics.

The same logic runs through the Balinese kecak chant, through Pygmy polyphony in the African rainforest, through tribal percussion traditions that Western musicology has consistently filed under "primitive" — meaning prior to the melodic line, prior to the individual voice organising sound from above. Rothenberg's provocation is that "prior" and "primitive" are not synonyms. The swarm is not a failed orchestra. It is the older model.

Western music theory constructed its entire architecture around the sustained individual melodic line — the singular voice, the composer as organising intelligence, the concert hall as the space in which that intelligence is received and judged. Granular synthesis, the electronic music technique developed by Curtis Roads and others from the 1970s onwards, arrived at insect logic through mathematics: sound broken into micro-pulses, continuity an illusion produced at sufficient distance. The technology reverse-engineered what the cicada chorus had always demonstrated. The conservatoire never noticed.

What the swarm offers as a compositional model — collective intelligence, horizontal synchronisation, rhythm emerging from biological constraint rather than notated intention — remains structurally alien to how Western institutions teach music. That the kecak and the katydid and Pithoprakta are pointing at the same thing is not, in Rothenberg's account, a curiosity. It is a diagnosis.

The invitation extends further. Every sustained tone is itself a composite event — a fundamental frequency accompanied by a cascade of overtones whose specific ratios determine what musicians call timbre: the colour that distinguishes a cello from an oboe on the same pitch. The single note, examined closely enough, is a swarm. Gérard Grisey and Tristan Murail — the founders of the spectralist movement — discovered exactly this when they placed a trombone tone under laboratory analysis in 1970s Paris and built an entire compositional language — musique spectrale — from what they found inside it.