What does bitonality mean?
Bitonality is a musical term describing the simultaneous use of two different keys, or tonalities, within a single piece of music. Rather than resolving all its harmonies to one tonal center, a bitonal work superimposes chords and melodic lines drawn from two separate keys, so that each layer remains coherent on its own even as the combined sound clashes with familiar expectations. The technique flourished among early twentieth-century modernists: Stravinsky's Petrushka (1911) contains perhaps the most celebrated instance, the so-called Petrushka chord, which pits C major against F-sharp major. Darius Milhaud and Béla Bartók also exploited it extensively. Bitonality is closely related to, but narrower than, polytonality, which covers any number of concurrent keys. The word carries a distinctly academic register, appearing mainly in music theory, criticism, and programme notes rather than casual conversation. For listeners, encountering bitonality often produces a striking sensation of tension and ambiguity, since the ear struggles to settle on a single home key.
nounThe simultaneous use of two different musical keys or tonalities in a composition, producing harmonies that belong to neither key alone. It is a technique most associated with early twentieth-century modernist composers.
- In music theory: the simultaneous combination of two different keys or tonal centers within a single passage or composition.
"Stravinsky's Petrushka famously employs bitonality, pitting the keys of C major and F-sharp major against each other in the famous Petrushka chord."
"Milhaud's Saudades do Brasil makes bold use of bitonality, layering Brazilian dance rhythms over conflicting harmonic planes."
"The composer's late quartets move from strict tonal writing to passages of deliberate bitonality that unsettle the ear."
Rarely used in the plural; the uncountable singular is standard except when referring to multiple instances across different works.
"The anthology surveys the bitonalities found in twentieth-century piano literature."
The infamous 'Petrushka chord' — C major crashing into F-sharp major — made audiences gasp in 1911 and turned bitonality into one of classical music's great scandals.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of bitonality
Bitonality derives from the Latin prefix bi- meaning 'two', combined with 'tonality', which itself traces back through French to Greek tónos, meaning 'tension' or 'pitch'. The term emerged in early twentieth-century European musical discourse, when composers and theorists needed vocabulary for the new harmonic experiments of Stravinsky, Milhaud, and their contemporaries. Its cognates include other formations built on tonality, such as atonality and polytonality, all sharing the same Greek root.
Related word forms
How bitonality is actually used
A technical term used almost exclusively in discussions of art music, particularly of early twentieth-century composers such as Stravinsky, Milhaud, Bartók, and Ravel. In everyday speech it would be opaque without context. Some writers treat 'bitonality' and 'polytonality' interchangeably, though strictly speaking polytonality is the broader category covering three or more keys as well as two.
Easily confused with bitonality
Bimodality refers to the presence of two modes or peaks (as in statistics or music theory), while bitonality specifically means two distinct musical keys sounding at once.
Polytonality is the general use of two or more keys simultaneously; bitonality is the narrower case involving exactly two.