Metamorphosis is usually presented as a rather dramatic business: caterpillars become butterflies, gods turn into animals, and unfortunate mortals discover that offending the wrong deity can have consequences considerably worse than a parking ticket. For Michel Mazza and Jeff Düngfelder, however, transformation is a quieter, more gradual affair. Their third collaboration as OdNu + Ümlaut, "Metamorphoses", takes the form of a single sixty-minute composition in which sounds continually change their function, identity and surroundings. A guitar phrase becomes a distant recollection; a rhythmic figure briefly suggests a more conventional musical structure before dissolving; electronic tones acquire an almost physical presence. The album's central idea is therefore expressed through its actual construction: music that does not merely describe change, but makes change its principal organising principle.

The partnership has developed considerably since "Abandoned Spaces" (2024), where the two musicians combined processed guitars, bass lines, drums and delicate electronic details in a collection of interconnected pieces. "Mitochondria Johatsu" (2025) extended their shared vocabulary, moving further into abstraction while retaining a melodic sensibility. Here, the individual tracks have disappeared altogether. The decision to work with one uninterrupted composition is significant because it changes the listener's relationship with the material. There are no titles to suggest a succession of separate destinations, no convenient pauses in which to check whether the washing machine has finished. Instead, the music establishes its own internal chronology, allowing ideas to return in altered circumstances and making transitions as important as the sounds themselves.

The creative process began with Düngfelder constructing a broad foundation from tape loops, electronics and processed material. Mazza then entered this environment with electric and MIDI guitar, clarinet, electronics and effects, responding to its possibilities through improvisation. The distinction between these two stages is not always perceptible in the finished recording, which is precisely the point. Rather than presenting a familiar arrangement of accompaniment and soloist, "Metamorphoses" creates a musical environment in which the contributions continually affect one another. The guitar does not simply decorate an electronic backdrop, while the loops do not function as a passive support system. Both become part of a circulating network of gestures, repetitions and transformations.

Their respective backgrounds make this approach particularly coherent. Buenos Aires-born Michel Mazza, who works as OdNu, has released more than twenty albums and developed a sound based on processed guitar, small recurring melodies, synthesised textures and field recordings. His parallel work in film editing, sound design and music composition has clearly informed his attention to atmosphere and the cinematic potential of apparently modest musical details. Jeff Düngfelder's Ümlaut project is more closely associated with minimal electroacoustic composition, tape manipulation, field recordings and the relationship between silence and sound. His work often treats environmental material as something to be recollected and rearranged rather than merely documented. Their shared experience of New York City, followed by their relocation to the countryside north of the metropolis, also provides an interesting biographical backdrop to music that frequently moves between organic impressions and electronically constructed spaces.

The opening establishes a vocabulary of small sounds and tentative melodic gestures. Water-like noises and clicks emerge alongside a recurring guitar figure, while soft electronic layers gradually establish a sense of depth. The music does not announce itself with the sort of grand introductory gesture that would make a film trailer editor particularly happy. Instead, it begins almost incidentally, as though the listener has entered a room where something has already been happening for some time. A restrained rhythmic pulse briefly appears, then gives way to warbling tones, piano-like sounds and fragments that hover somewhere between melody and texture. These elements are recognisable enough to provide orientation, but never remain in place for long.

One of the composition's most engaging qualities is its ability to introduce rhythm without allowing it to become the governing principle. Percussive sounds surface at intervals, sometimes suggesting a beat, sometimes merely adding a momentary sense of movement. They are subsequently withdrawn, leaving the melodic and textural material to reorganise itself. This gives the piece an unusual elasticity. It can momentarily approach ambient jazz, drift towards electroacoustic abstraction, or hint at a more conventional electronic composition, only to abandon the suggestion before it becomes a settled identity. There is a certain mischievousness in this behaviour. Just when the listener thinks they have worked out what kind of music they are hearing, the musicians quietly rearrange the furniture.

The central portion contains some of the album's most striking episodes. Around the twenty-minute mark, reversed percussion and resonant piano-like figures introduce a slightly more mysterious atmosphere. A brighter melodic passage subsequently emerges, offering one of the composition's rare moments of unmistakable uplift. It is followed by environmental sounds and rustling textures that are incorporated into the musical fabric rather than presented as documentary interruptions. Later, a darker melodic fragment and processed, harp-like tones alter the emotional temperature again. These changes are not organised around conventional climaxes. Instead, the music accumulates small moments of contrast, allowing one atmosphere to contaminate the next. The effect is less like watching a story unfold than observing a series of images whose edges have begun to overlap.

Mazza's melodic instincts are particularly important in preventing the composition from becoming an exercise in atmospheric suspension. Even when the guitar is heavily processed, its phrasing retains a sense of human gesture. Brief melodic figures appear, disappear and return in modified form, providing a thread that connects otherwise disparate sections. His clarinet contribution is absorbed into the broader electronic palette, adding another possible source of timbre without demanding attention as a featured instrument. Düngfelder, meanwhile, gives the composition much of its structural continuity through loops and recurring sonic details. His approach allows repetition to function as a form of memory: something recognisable returns, but its surroundings have changed sufficiently to make it feel different.

The album's later passages become more spacious and occasionally more rhythmic. Guitars reappear against sustained electronic layers, with wind-like tones and heavily reverberated sounds giving the music an almost architectural depth. Gradually introduced drums and hi-hats briefly create a more defined pulse, while another melodic passage brings a welcome degree of brightness. Yet the apparent stability never lasts. Guitar effects become rougher, delayed sounds trail away into the mix, and the environmental material gradually assumes greater importance. Water returns in the closing stretch, recalling the opening while avoiding the neatness of a perfectly symmetrical ending. The composition eventually settles into sustained tones, bells and fading electronic details, with its final gestures suggesting continuation rather than resolution.

There is a potential danger in music of this kind: the hour-long format can easily become an excuse for simply accumulating agreeable textures until the available storage space runs out. "Metamorphoses" largely avoids that trap because its changes are not merely ornamental. The recurring melodic material, subtle rhythmic interventions and carefully placed environmental sounds provide a sense of development, even when the music remains deliberately understated. It also benefits from the fact that both musicians have established individual practices capable of supporting this kind of extended collaboration. Their shared language is not based on erasing every difference, but on allowing those differences to become useful components of a larger process.

The album's title inevitably invites philosophical associations, but its transformation is not especially interested in grand declarations about the nature of existence. It is more convincing when considered at the level of sound itself. A melody changes meaning according to its surroundings; a recording of water can become percussion, atmosphere or memory; an electronic pulse can briefly resemble something organic. These transformations are modest, sometimes almost imperceptible, yet they alter the listener's sense of what is happening. The artwork by Düngfelder, with its overlapping translucent forms, offers a visual counterpart to this method without needing to illustrate every musical development.

"Metamorphoses" ultimately rewards attention through accumulation rather than spectacle. Its sixty minutes contain enough changes to prevent the experience from becoming static, but the musicians resist the temptation to make every new idea announce its arrival with a fanfare. This is music that understands the value of letting an idea become familiar before quietly changing its circumstances. There is no need for a caterpillar to explain the mechanics of its transformation, and Mazza and Düngfelder wisely avoid doing so. They simply allow the sounds to alter, multiply, recede and return, until the listener realises that the landscape encountered at the beginning has become something else. The process is patient, occasionally playful and quietly absorbing, with the added advantage that nobody needs to emerge from a chrysalis at the end.