Musical Form
Serialism / Twelve-Tone Music
A compositional method that treats all twelve notes as equals.
20th Century Technique
Serialism, and specifically the twelve-tone technique that Arnold Schoenberg developed in the 1920s, is a method for composing music without a traditional home key. The composer arranges all twelve notes of the chromatic scale into a fixed sequence, called a tone row, and then builds the entire piece from that row and its transformations, with no single note allowed to function as a tonal center the way a home key would in earlier music.
Why it was invented
By around 1908, Schoenberg had already abandoned tonality, writing atonal music with no home key at all. But without the old rules of harmony to guide him, he found it hard to build long, coherent works. The twelve-tone method, which he worked out in the early 1920s, was his solution: a way of organizing atonal music so that every note in the chromatic scale is treated equally, and no one note can start to sound like a home.
How a tone row works
The row uses each of the twelve notes exactly once, in an order the composer chooses. The whole piece is then built from it - as melodies, chords, or both - in four basic forms:
- Prime - the row as written.
- Retrograde - the row backward.
- Inversion - the row upside down, every interval flipped.
- Retrograde inversion - upside down and backward.
Each form can also start on any of the twelve notes, giving 48 versions of the row in all. The listener isn't expected to track the row note by note, any more than a listener is expected to hear every key change in Mozart - the row gives the music its underlying unity.
The Second Viennese School
The technique was a deliberate, radical break from centuries of tonal harmony, and it proved hugely influential on later 20th-century composers, even those who eventually moved away from it - it reframed what "organizing" a piece of music could even mean, beyond a home key and its relationships. Schoenberg, along with his students Alban Berg and Anton Webern, is often grouped as the Second Viennese School. Berg used rows that hint at traditional chords, and his Violin Concerto (1935), which even quotes a Bach chorale, is often considered the most approachable twelve-tone masterpiece. Webern went the other way, writing tiny, crystalline pieces in which every note counts.
Total serialism
The postwar generation that followed - Messiaen, Boulez, Babbitt, and Stockhausen, drawing especially on Webern's example - pushed the underlying idea further, applying serial ordering not just to pitch but to rhythm, dynamics, and articulation as well, a more extreme approach sometimes called total serialism. Even Stravinsky, long seen as Schoenberg's opposite, adopted serial techniques in his seventies.
A divisive legacy
The technique remains genuinely divisive: some listeners and critics prize its rigor and the way it opened composition to material tonal harmony couldn't reach, while others find twelve-tone music deliberately, even punishingly, difficult to follow by ear - a debate that was already alive in Schoenberg's own lifetime and hasn't fully settled since. Minimalism was partly a reaction against it. Yet its unsettling sound found a natural home in film, where atonal and serial techniques often accompany suspense, horror, and science fiction.
Where to start listening: Schoenberg's Pierrot lunaire (written about a decade before he formalized the twelve-tone method, but in the same harmonic world) is a good introduction to the sound before tackling a fully twelve-tone work. Then try Berg's Violin Concerto, often called the most lyrical twelve-tone music ever written.