Overview
In music, intonation has two linked meanings. First, it denotes how accurately a performer or ensemble produces pitches relative to a reference pitch or each other. Second, it refers to the tuning principles or system that determine the precise frequencies of notes (for example, equal temperament versus just intonation). Both senses affect how consonant, expressive, or stylistically appropriate music sounds.
Elements and measurement
Intonation in performance depends on the ear, instrument, and context. Singers and players of fretless or flexible-pitch instruments (strings, brass, voice) can adjust pitch continually; fixed-pitch instruments (piano, fixed frets) cannot. Technically, pitch deviations are measured in cents, and listeners notice small offsets as beats or a sense of beating when two close frequencies interact. Tools such as electronic tuners, spectrum displays, and tuning forks help assess and train intonation.
Factors and tuning systems
- Factors affecting intonation: ear training, instrument setup, ensemble blending, vibrato, temperament, and acoustics.
- Tuning systems: equal temperament distributes the octave evenly and is standard on modern keyboards; just intonation favors pure-sounding simple-ratio intervals; meantone and historical temperaments represent intermediate compromises.
History and development
Historical preferences for tuning have changed with musical style and technology. Before widespread keyboard equality, many ensembles tuned to pure intervals in a given key, producing different sonorities across keys. The rise of keyboard-fixed instruments, orchestral standardization, and the demands of harmonic modulation encouraged adoption of equal temperament in Western art music, while many folk and vocal traditions retain local tuning practices.
Practical importance and examples
Good intonation is essential for clear harmony in choirs, tuning of orchestral strings, and expressive solo playing. A quartet adjusts microintonation to match timbre and tuning; a singer may flatten or sharpen notes for stylistic effect. Composers and performers sometimes exploit tuned differences—such as intentionally narrow or wide intervals—to create color or tension.
Distinctions and notable facts
Intonation should not be confused with articulation or phrasing, though these interact. In ethnomusicology, "intonation" can also mean characteristic melodic openings of chants or songs. Understanding both the technical and cultural sides of intonation helps performers make informed choices about tuning, ensemble balance, and expressive nuance. For further reading see intonation.