Exploring Minimalism: Philip Glass and Steve Reich

Minimalism reshaped twentieth-century classical music by challenging conventional ideas about musical development, harmony and form. Emerging in the United States during the 1960s, the movement replaced many of the dramatic contrasts and dense textures of modernist composition with repetition, gradual transformation and clearly defined musical patterns. Its composers discovered that music could sustain attention not through constant novelty, but through subtle changes in material that initially appeared almost static. Among the most influential figures in this development were Philip Glass and Steve Reich, whose contrasting approaches helped establish minimalism as a major force in contemporary music.

Although both composers draw on repetition and rhythmic structure, they developed distinct musical languages. Glass builds expansive compositions through recurring arpeggios, additive rhythms and shifting harmonic patterns, creating a sense of continuous accumulation. Reich, by contrast, has often explored how repeated patterns interact, using phasing, rhythmic displacement and carefully controlled processes to reveal unexpected relationships between sounds. Their music has influenced generations of composers and extended minimalism's reach into opera, film, dance and popular music.

To understand their significance, it is necessary to look beyond the repeated notes that often define minimalism in the public imagination. Glass and Reich transformed repetition from a compositional device into a way of hearing, inviting listeners to discover movement within stillness and complexity within apparent simplicity.

The emergence of American minimalism

Minimalism developed within a diverse experimental environment in post-war America, partly in response to the complexity of European avant-garde music. Composers such as Pierre Boulez and Karlheinz Stockhausen explored systematic approaches to pitch, rhythm and musical organisation. For a younger generation of American composers, however, these techniques represented only one possible direction for contemporary music.

Artists including La Monte Young, Terry Riley and Pauline Oliveros helped establish alternative approaches to composition through sustained tones, improvisation, repetition and experimentation with sound. Riley's In C (1964), with its modular patterns performed in flexible relationships, became an important landmark in the development of repetitive music. Rather than treating musical development as a succession of contrasting themes, these composers explored how a limited amount of material could generate extended and evolving experiences.

The term minimalism was borrowed from the visual arts, where artists such as Donald Judd and Sol LeWitt explored geometric forms, repetition and the reduction of artistic materials. In music, however, the label describes a range of practices rather than a single method. Some compositions unfold through slowly changing tonal patterns, while others rely on interlocking rhythms, sustained sounds or the gradual alteration of short melodic figures.

Encounters with musical traditions outside the Western classical canon also shaped the movement. Glass studied with Indian sitarist and composer Ravi Shankar in the 1960s and worked with tabla player Alla Rakha, learning to approach rhythm through different systems of organisation. Reich studied drumming in Ghana in 1970, an experience that deepened his understanding of rhythmic independence and ensemble performance. These encounters influenced both composers, although neither simply reproduced the traditions they encountered. Instead, each developed an individual musical language through which new rhythmic and structural possibilities could be explored.

American minimalism therefore emerged from several overlapping currents: experimental composition, alternative approaches to listening, cross-cultural encounters and a renewed interest in the perceptual effects of repetition. Glass and Reich became two of its most prominent representatives, but their music demonstrates how differently these ideas could be developed.

Philip Glass

Born in Baltimore in 1937, Philip Glass studied at the Juilliard School in New York before continuing his education in Paris with the influential pedagogue Nadia Boulanger. His later work with Ravi Shankar introduced him to rhythmic structures that differed from those commonly encountered in Western classical composition. Returning to New York in 1967, Glass established the Philip Glass Ensemble, whose amplified keyboards and woodwind instruments became central to his early musical style.

Glass's early compositions are built around recurring melodic fragments that expand, contract and shift their rhythmic emphasis. One of his principal techniques, known as additive process, involves gradually adding or removing notes from a repeated musical pattern. A phrase might begin with five notes before expanding to six or seven, subtly changing its rhythmic character while retaining its underlying identity.

The effect is cumulative. A pattern that initially seems stable begins to reveal new possibilities as its internal structure changes. Rather than abandoning familiar material in favour of a contrasting theme, Glass draws momentum from the transformation of what the listener already knows. His music can create a powerful sense of forward motion without relying on the dramatic harmonic shifts traditionally associated with musical development.

This approach is evident in Music in Twelve Parts, composed between 1971 and 1974. Lasting approximately four hours in performance, the work explores the interaction of repeating melodic figures, interlocking rhythms and gradually shifting harmonies. Its sustained patterns create a distinctive musical environment: bright keyboard figures cycle continuously, while changes in accent, texture and harmonic emphasis gradually reshape the listener's experience. The challenge is not to follow a conventional narrative, but to notice how a musical idea changes while remaining recognisable.

Glass brought these principles into the theatrical world with Einstein on the Beach, created with theatre director Robert Wilson and premiered in 1976. Lasting approximately five hours, the opera departs from conventional narrative and character development. Instead, it combines repetitive musical patterns with abstract imagery, choreographed movement, numbers and solfège syllables.

The work challenges the expectation that an opera must advance through a clearly defined sequence of dramatic events. Its recurring musical structures establish a framework in which visual images and stage movements acquire their own significance. The audience is encouraged to experience the performance through accumulation, association and changes in attention rather than through a conventional plot. Music becomes not merely an accompaniment to theatrical action, but one of the principal means through which the audience experiences time.

Glass's work in cinema demonstrates another dimension of his musical language. In films such as Koyaanisqatsi (1982), Kundun (1997) and The Hours (2002), recurring patterns create continuity, intensify emotion and establish relationships between images. The music can suggest urgency or contemplation while allowing the visual material to shape the larger experience. Repetition becomes a cinematic resource, sustaining an emotional atmosphere without dictating every detail of the narrative.

Glass's career also illustrates how a once-radical compositional approach can reach audiences beyond contemporary classical music. His extensive output includes operas, symphonies, concertos, chamber music and film scores. Although his musical language has evolved considerably, the transformation of recurring material remains an important feature of his work.

Steve Reich

Born in New York in 1936, Steve Reich developed a compositional approach that placed particular emphasis on the relationship between musical process and perception. His early works investigate how repeated patterns can interact to create changes in what listeners hear, even when the underlying material remains remarkably simple.

A defining example is It's Gonna Rain (1965), a tape composition constructed from a recording of a Pentecostal preacher delivering a sermon. Reich initially played two identical tape loops in synchronisation. As the loops gradually moved out of alignment, the recorded words generated increasingly intricate rhythmic patterns. Fragments of speech overlapped, accents shifted and new combinations of sound emerged from material that had not itself changed.

This technique, known as phasing, became central to Reich's early work. Two performers or recordings begin by playing the same musical figure together. One gradually moves ahead of the other, producing new rhythmic relationships as the patterns slip out of alignment. The process is systematic, but its audible results can be surprising: listeners begin to hear accents and melodic shapes that neither performer produces independently.

In Piano Phase (1967), two pianists repeat the same short melodic pattern. One gradually accelerates until the relationship between the parts changes, creating new combinations of notes and accents. The music seems to generate fresh material from within itself. What begins as a clear, shared figure becomes a shifting web of rhythmic possibilities, demonstrating that repetition can produce change through the interaction of sounds rather than through the introduction of new themes.

Reich's study of traditional Ewe drumming in Ghana in 1970 deepened his understanding of complex rhythmic organisation and the independence of simultaneous musical patterns. He also explored Indonesian gamelan traditions, broadening his understanding of timbre, repetition and ensemble relationships. These experiences influenced his subsequent development, although his phasing experiments had begun several years earlier with tape recordings.

The influence of rhythmic interaction is particularly evident in Drumming (1971), a large-scale composition for percussion, voices and piccolo. The work unfolds through interlocking patterns, shifts in timbre and the gradual substitution of beats for rests. Individual parts remain relatively simple, yet their combination produces a dense, continuously changing musical texture. The performers must maintain precise relationships while the audience listens for the larger patterns that emerge from their interaction.

With Music for 18 Musicians (1974–76), Reich expanded his musical language beyond the phasing processes of his early compositions. The work retains a strong rhythmic pulse but gives greater prominence to harmony, melodic development and instrumental colour. Built around a cycle of chords, it moves through a sequence of sections whose transitions are signalled by changes in the ensemble's texture.

The result is both tightly organised and expansive. Pulsating marimbas and pianos establish a rhythmic foundation, while voices, strings and other instruments weave overlapping melodic figures above it. Harmonies change gradually, producing a sense of movement that is less abrupt than conventional harmonic progression but more expansive than the early phase pieces. Repetition here becomes a framework for harmonic richness, allowing a stable pulse to support an unusually fluid musical experience.

Reich's later work also demonstrates that minimalist techniques can engage directly with historical memory and political violence. His 1988 composition Different Trains, written for string quartet and tape, juxtaposes his childhood memories of travelling by train across the United States with the experiences of European Jews transported during the Holocaust.

The composition combines recorded voices, train sounds and string writing. Reich shapes the instrumental melodies around the contours and rhythms of recorded speech, turning fragments of testimony and recollection into musical material. The result is unsettling: the familiar sounds of travel acquire a darker significance as personal memory is placed alongside historical catastrophe.

Different Trains reveals an important dimension of Reich's work. His interest in process and repetition does not confine his music to abstract experimentation. The same attention to rhythmic detail that shapes his early compositions can also give recorded voices a musical form while preserving their historical and emotional significance.

Two approaches to a shared musical language

Glass and Reich helped establish minimalism as a major movement in contemporary music, but their work reveals different ways of organising musical time and directing attention.

For Glass, repetition often creates a sense of continuous accumulation. Recurring arpeggios, additive rhythms and harmonic cycles gradually transform a musical environment without necessarily disrupting its underlying momentum. The listener becomes immersed in patterns whose changes may initially seem almost imperceptible. In his operas and film scores, this approach can sustain an atmosphere of intensity or contemplation while allowing music to interact with visual and dramatic material.

Reich has often made the process of change more explicit. In works such as Piano Phase, the listener can hear patterns slipping out of alignment and generating new rhythmic relationships. Attention shifts between the individual parts and the unexpected figures produced by their combination. His music frequently makes listening itself part of the subject: the audience becomes aware of how perception changes as familiar sounds are reorganised.

This distinction should not be treated as an absolute division. Glass's music also depends on close attention to process, while Reich's later compositions can be deeply immersive and harmonically expansive. Nevertheless, their contrasting emphases help explain why minimalism encompasses such a variety of listening experiences.

Their approaches also differ in the ways they engage with material beyond abstract musical structure. Glass has frequently collaborated with theatre directors, choreographers and filmmakers, developing works in which music interacts with images, movement and dramatic form. Reich has often incorporated recorded speech, documentary material and historical events, connecting musical organisation with questions of memory and identity.

Both composers demonstrate that musical complexity does not necessarily depend on constant change. A limited collection of notes can generate a rich experience through rhythm, harmony, repetition and the shifting relationships between musical parts. Their achievement lies not simply in reducing musical material, but in discovering new possibilities within it.

The influence of minimalism

The influence of Glass and Reich extends well beyond the concert hall. Their work has helped shape contemporary classical composition, electronic music, film scoring, dance and experimental popular music. Repetitive structures, sustained pulses and gradual development have become familiar features of many musical genres, although their use in other contexts does not always carry the same aesthetic or conceptual aims.

Their compositions have also challenged conventional assumptions about musical complexity. A work need not introduce a new theme every few minutes or rely on dramatic harmonic contrasts to sustain attention. Complexity can emerge through the interaction of simple elements, while repetition can encourage listeners to notice details that might otherwise go unheard.

Neither composer has remained confined to the techniques of his early career. Glass has expanded his vocabulary through opera, symphonic writing and collaborations across artistic disciplines. Reich has continued to explore new instrumental combinations, rhythmic relationships and historical subjects. Their subsequent work shows that minimalism was not a fixed set of rules, but a starting point for sustained artistic development.

Glass and Reich transformed repetition into a way of hearing. Glass often reveals how recurring patterns can accumulate into expansive musical structures; Reich shows how their interaction can alter perception and bring unexpected relationships into focus. Both composers challenge the assumption that musical movement requires constant novelty. Sometimes, a pattern need not disappear for change to occur. The listener simply needs to hear it differently.