The Twentieth Century

Modernism, jazz and popular music

Debussy

When: 1862–1918
Where: Europe

Claude Debussy explored timbre, modal collections and harmonic ambiguity.

Stravinsky's Rite of Spring

When: 1913
Where: Europe

Rhythmic layering and orchestral force helped make the ballet a modernist landmark.

Schoenberg and twelve-tone technique

When: 1920s
Where: Europe

Arnold Schoenberg developed a method organizing all twelve pitch classes in ordered rows.

Ragtime

When: Late 19th–early 20th centuries
Where: North America

African American composers such as Scott Joplin built syncopated piano styles that fed into jazz.

Early jazz

When: Early 20th century
Where: North America

Black American musicians, notably in New Orleans, developed collective improvisation in small bands.

Louis Armstrong

When: 1901–1971
Where: North America

His improvisation and phrasing reshaped jazz solo performance.

Swing era

When: 1930s–1940s
Where: North America

Large jazz ensembles brought arranged dance music and improvisation to mass audiences.

Bebop

When: 1940s
Where: North America

Musicians including Charlie Parker and Dizzy Gillespie developed rapid, harmonically adventurous improvisation.

Blues recording and circulation

When: 1920s onward
Where: North America

Records carried regional blues styles far beyond their home communities and shaped later popular music.

Rock and roll

When: 1950s
Where: North America

Rock and roll grew from rhythm and blues, gospel and country, and many of its pioneers were Black American musicians.

When: Late 1950s onward
Where: North America

Improvisers explored sustained modal frameworks rather than rapid chord changes.

Minimalism

When: 1960s onward
Where: North America

Repetition, process and gradual change became important compositional resources.

Hip-hop

When: 1970s onward
Where: North America

DJ, MC, dance and graffiti practices from Black and Latino communities in the Bronx grew into a global musical culture.

Electronic dance music

When: Late 20th century onward
Where: Global

Sequencers, synthesizers and club cultures supported numerous dance-music styles.

Other chapters: Early Musical Cultures · Medieval and Renaissance Worlds · Baroque and Classical · The Nineteenth Century · Traditions Around the World · Recording and Technology

Dates mark documented developments or approximate periods, not the beginnings of traditions. Many histories run side by side. Dates are given as the timeline records them. Where a date is approximate, the entry says so.

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