The omnibus progression in music is a

chord progression In a musical composition, a chord progression or harmonic progression (informally chord changes, used as a plural) is a succession of chords. Chord progressions are the foundation of harmony in Western musical tradition from the common practice ...

characterized by chromatic lines moving in opposite directions. The progression has its origins in the various Baroque harmonizations of the descending

chromatic fourth In music theory, a chromatic fourth, or ''passus duriusculus'',Monelle, Raymond (2000). ''The Sense of Music: Semiotic Essays'', p.73. . is a melody or melodic fragment spanning a perfect fourth with all or almost all chromatic intervals fill ...

in the bass ostinato pattern of

passacaglia The passacaglia (; ) is a musical form that originated in early seventeenth-century Spain and is still used today by composers. It is usually of a serious character and is often based on a bass-ostinato and written in triple metre. Origin The ter ...

, known as the "

lament bass In music, the lament bass is a ground bass, built from a descending perfect fourth from tonic to dominant, with each step harmonized.Brover-Lubovsky, Bella (2008). ''Tonal Space in the Music of Antonio Vivaldi'', p.151-52. . The diatonic versio ...

". However, in its fullest form the omnibus progression involves a descent in the

bass Bass or Basses may refer to: Fish * Bass (fish), various saltwater and freshwater species Music * Bass (sound), describing low-frequency sound or one of several instruments in the bass range: ** Bass (instrument), including: ** Acoustic bass gui ...

which traverses a whole

octave In music, an octave ( la, octavus: eighth) or perfect octave (sometimes called the diapason) is the interval between one musical pitch and another with double its frequency. The octave relationship is a natural phenomenon that has been refer ...

and includes every note of the

chromatic scale The chromatic scale (or twelve-tone scale) is a set of twelve pitches (more completely, pitch classes) used in tonal music, with notes separated by the interval of a semitone. Chromatic instruments, such as the piano, are made to produce the ...

. It may also include one or more chromatic ascending

tetrachord In music theory, a tetrachord ( el, τετράχορδoν; lat, tetrachordum) is a series of four notes separated by three intervals. In traditional music theory, a tetrachord always spanned the interval of a perfect fourth, a 4:3 frequency propo ...

s in the

soprano A soprano () is a type of classical female singing voice and has the highest vocal range of all voice types. The soprano's vocal range (using scientific pitch notation) is from approximately middle C (C4) = 261 Hz to "high A" (A5) = 880&n ...

tenor A tenor is a type of classical music, classical male singing human voice, voice whose vocal range lies between the countertenor and baritone voice types. It is the highest male chest voice type. The tenor's vocal range extends up to C5. The lo ...

and

alto The musical term alto, meaning "high" in Italian (Latin: ''altus''), historically refers to the contrapuntal part higher than the tenor and its associated vocal range. In 4-part voice leading alto is the second-highest part, sung in choruses by ...

. They are also known as "chromatic wedge progressions", in reference to their wedge-like appearance in score. Gauldin, Robert. "The Theory and Practice of Chromatic Wedge Progressions in Romantic Music." ''

Music Theory Spectrum ''Music Theory Spectrum'' () is a peer-reviewed, academic journal specializing in music theory and analysis. It is the official journal of the Society for Music Theory, and is published by Oxford University Press. The journal was first published ...

'', vol. 26, no. 1. (Spring 2004), pp. 1–22. The origin of the term "omnibus" (Latin: "for all") to describe such a sequence is unclear, but it is of note that the chord progression encompasses ''all'' of the notes in the

A simple example

The following example is in C major. The lowest part is a "lament bass" that descends from the tonic to the dominant using chromatic passing tones before returning at the end up to the tonic in a

perfect cadence In Western musical theory, a cadence (Latin ''cadentia'', "a falling") is the end of a phrase in which the melody or harmony creates a sense of full or partial resolution, especially in music of the 16th century onwards.Don Michael Randel (1999) ...

. The upper voice moves in the opposite direction from the dominant note up to the tonic. The chord names are given, followed where necessary by the

inversion Inversion or inversions may refer to: Arts * , a French gay magazine (1924/1925) * ''Inversion'' (artwork), a 2005 temporary sculpture in Houston, Texas * Inversion (music), a term with various meanings in music theory and musical set theory * ...

figured bass Figured bass is musical notation in which numerals and symbols appear above or below (or next to) a bass note. The numerals and symbols (often accidentals) indicate intervals, chords, and non-chord tones that a musician playing piano, harpsic ...

. For example, 'Cm' refers to a C minor triad in second inversion, and G is a G dominant seventh in third inversion. A more extended treatment of this version of the omnibus could be: : For the purposes of

composition Composition or Compositions may refer to: Arts and literature *Composition (dance), practice and teaching of choreography *Composition (language), in literature and rhetoric, producing a work in spoken tradition and written discourse, to include v ...

, the pattern may be halted at any point, and in so doing may facilitate

modulation In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the ''carrier signal'', with a separate signal called the ''modulation signal'' that typically contains informatio ...

to any desired

key Key or The Key may refer to: Common meanings * Key (cryptography), a piece of information that controls the operation of a cryptography algorithm * Key (lock), device used to control access to places or facilities restricted by a lock * Key (map ...

Dominant prolongation

Modern theorists such as Telesco explain how small sections of omnibus progression (signified in example 1 by brackets around groups of chords) can be viewed as an instance of dominant

prolongation In music theory, prolongation is the process in tonal music through which a pitch, interval, or consonant triad is considered to govern spans of music when not physically sounding. It is a central principle in the music-analytic methodology of ...

achieved through

voice exchange In music, especially Schenkerian analysis, a voice exchange (german: Stimmtausch; also called voice interchange) is the repetition of a contrapuntal passage with the voices' parts exchanged; for instance, the melody of one part appears in a second ...

. Example 2 (above) is effectively a prolongation of the dominant seventh chord G⁷ which utilises chromatic voice movement. The bass voice descends chromatically while the upper voice ascends chromatically, and the inner voices remain stationary on the notes of D and F. Eventually the chromatic movement results in a new inversion of the dominant seventh chord G⁷, resolving to the tonic chord C.

References

External links

Examples of the Omnibus, compiled by Prof. Timothy Cutler
{{Chord progressions Chord progressions

A simple example

Dominant prolongation

References

Further reading

External links