"A Pierre. Dell’azzurro silenzio, inquietum" Luigi Nono. The Score.

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Dedicated to Pierre Boulez on the occasion of his 60th anniversary (on 26th March 1985), the composition A Pierre. Dell’azzurro silenzio, inquietum received its first performance on 31st March 1985 in Baden-Baden by Roberto Fabbriciani and Ciro Scarponi; the live electronics part was prepared by the Experimental Studio in Freiburg in Breisgau. 

The score was finished on 20th February 1985. The cooperation of Luigi Nono with flutists Roberto Fabbriciani and clarinettist Ciro Scarponi and their consulting in the field of instrumentation played a major role in Nono’s late output. 

The two musicians’ congenial concert performances, with the richness of harmonics of the contrabass flute and contrabass clarinet, determined the specific timbral aura of the work: it is difficult to distinguish which sounds are played by acoustic instruments and which are generated live in the electronics part. 

The composer was seeking precisely that perfect union between two types of sonority, because only then could he create that uninterrupted tissue, continuously fluctuating, characterized by an extremely subtle but insistent inner mobility. It is a sonority deployed in space and written for space, that actualizes on the threshold between sound and the “blue silence”. 

Mobility and spatiality are the two principal characteristics of the work. 

Luigi Nono did use the indication “a piú cori” on purpose in this work written for just two instruments, adopting the nomenclature of Venetian polychoral music of the Gabrielis – an indication that he used often, by the way: e.g. he called his seven instrumental groups “choirs” in 2° No hay caminos, hay que caminar… … Andrej Tarkowskij. Nono thus wrote in the short liner note to that composition:  

A few choirs ever changing  Formants of the voice – timbres –  interdynamised spaces  and some possibilities  of transformation through live electronics.  

It is the formula “a few choirs ever changing” that draws our attention. In both solo parts, whose dynamics oscillate between p and ppppp with rare incursions of mezzo forte, a continuous variability of sound emission is required, from the standard technique up to a hiss, with different participation (or lack thereof) of determined pitches, sharp “Aeolian“ tones, whistles, clusters, harmonics, occasionally with the presence of an interrupted basic “shadow tone“. 

(liner notes by Paolo Petazzi, Luigi Nono e il suono  

elettronico. 10° Festival di Milano Musica,  

Teatro Studio, 9 October 2000) 

The electronic part, determining the spatial effect of the work, helps to perceive the at times incorporeally light timbre of the instruments, transforms it and reclaims it through the use of delay, making the taped sound become an element of the natural sound. 

The delay, in fact, makes the instrumental sound perceivable even after the soloist has become silent. The fusion between acoustic instruments and electronics that is the hallmark of this work is expressed in this continuity, too.  

There are Laws of Randomness...

The Laws of Randomness

Random is not the opposite of order. It is a kind of order that hides in plain sight. We miss it because we look for patterns that repeat, while randomness speaks in patterns that only appear when you step back and listen across time, across many events, across many trials. This article expands a simple claim from the studio: there are laws of randomness, and they are musically useful.

What randomness really gives a composer

Randomness is not a shrug. It is a rule set with three persistent traits. First, it has a distribution, which tells you how often values tend to occur. Second, it has memory or lack of memory, which tells you whether the present depends on the past. Third, it has scale, which tells you how behavior changes as you zoom in or out. Once you name those traits, randomness stops being a blur and becomes a tool.

White noise spreads energy evenly across frequency. Pink noise tilts energy toward the low end so large shapes move slowly while small shapes chatter on top. Brown noise leans even further toward drift. Blue and violet noise answer with the reverse energy tilt. None of this is decoration. Each family creates a different sense of phrase, space, and attention. The audience hears the law even if they never learn the term.

Chance is a craft

John Cage opened the door to chance but he did not abandon craft. Iannis Xenakis placed chance inside formal structures that carry weight and direction. The lesson is clear. You can let an aleatoric process pick events while you choose the ranges, the mappings, and the scale of change. You allow surprise inside a frame that has a voice.

In practice I keep four levers on the table. I choose the noise family. I choose the time window over which the law is allowed to speak. I choose the mapping from numbers to sound. I choose where the human ear will override the result. The moment you state those levers, the music gains character rather than collapsing into fog.

Laws as notational grammar

Scores can present these laws with clarity. A legend can declare the family of randomness for each layer. A texture of dots can indicate one family, a field of diagonals another. Density bands can set the allowable range for entries per second. A ruler can carry proportional time so movement across a zone equals a known duration. A narrow strip of fine grain can tell players that behavior is almost memoryless. A broad cloud of slow shapes can tell them that history matters.

The page becomes a field where players navigate laws rather than follow a single line. They read like surveyors. They triangulate position by landmarks. They balance local choice against the global distribution. Rehearsal becomes research. The ensemble looks for how far the law can bend and still hold.

Randomness and perception

Listeners do not carry stopwatches, yet they hear statistical truth. A stretch governed by white noise feels restless. A stretch governed by pink noise feels grounded, like weather that rolls rather than skitters. A stretch governed by a Poisson process reads as events that arrive with a steady average but with unruly gaps and bunching. If you let the arrival rate slowly rise, the audience will feel a change in pressure long before they could count it.

This is why random with rules can outlast invention for its own sake. Invention often fizzes then fades. A law keeps the air alive because it sustains surprise inside a recognisable climate.

Bias and the myth of pure chance

Humans are poor generators of randomness. We avoid streaks, we mirror patterns, we correct too quickly. Pseudorandom software can be no better if the seed is obvious or the algorithm repeats within a small cycle. The cure is modest. Use a tested generator. Save your seed so a rehearsal can be reconstructed. When the piece needs the smell of the street, borrow randomness from the world. Record traffic, leaf flutter, or room noise. Translate that energy into entrances, articulations, or bow pressure. Nature rarely lies about statistics.

Testing the field

Composers can and should test their own chance systems. Look for clumps and deserts. Check that the average rate matches what the legend promises. If crescendos are supposed to emerge from the mass, verify that the distribution allows the emergence at the right scale. If a performer must make three choices per minute on average, watch a clock during rehearsal and see whether the demand is humane. The law is only useful when it fits the body.

Ensemble ethics

Randomness changes the social fabric of a group. It relocates authority from a single leader to a shared practice of attention. Players learn to listen for the climate rather than a fixed melody. They watch density. They watch neighbors. They cultivate restraint since the law already provides motion. The score becomes a set of conditions that foster good choices and good timing. This is less about surrender and more about a different form of responsibility.

Forms that breathe

Large form can arise from slow motion in the parameters of a law. Increase the average arrival rate and you build tension without a single heroic gesture. Shift from white to pink to brown and the space settles, as if the room itself took a breath. Move from independent entries to correlated entries and the crowd suddenly acts with purpose. None of this requires a plot. It requires attention to how small causes stack up when time is long.

Archival habits for the living piece

If a work relies on law based processes, preserve the recipe. Keep the seed, the mapping, the scale, the ranges, and the rules for human override. Print the legend so future performers can reconstruct not just the notes but the climate. The score then remains alive without turning into mist. A work can change from reading to reading, yet it keeps a memory of how it thinks.

Exercises from the studio

Take a two minute span and fill it using white noise to place entries for three instruments. Keep dynamics within a narrow band. Listen for the sense of flicker. Repeat with pink noise and notice how the floor seems to rise. Now hold the arrival pattern constant and map the noise to pitch within a bounded mode. Observe how the same law that governs time can govern height. Finally, let performers veto any event that falls within a small window around another event they just played. You will hear how a tiny rule produces spacing that feels natural.

Closing

Randomness is not a loophole. It is a literature with grammar and style. Once you name the distribution, the memory, and the scale, you gain a set of levers that can be tuned with elegance. The listener hears the result as weather with character. The players feel the room as a field that is both permissive and exact. The score stops pretending to predict every instant and starts telling the truth about uncertainty.

There are laws of randomness. They do not cancel expression. They are the conditions under which expression can move without exhaustion.