I−vi−ii−V
Encyclopedia
I−vi−ii−V is a very common "chord
Chord (music)
A chord in music is any harmonic set of two–three or more notes that is heard as if sounding simultaneously. These need not actually be played together: arpeggios and broken chords may for many practical and theoretical purposes be understood as chords...

 pattern" in jazz
Jazz
Jazz is a musical style that originated at the beginning of the 20th century in African American communities in the Southern United States. It was born out of a mix of African and European music traditions. From its early development until the present, jazz has incorporated music from 19th and 20th...

 and popular styles of music. It is often used as a turnaround
Turnaround
Turnaround may refer to:* Turnaround , a type of traffic junction* Turnaround, in aviation maintenance, the process of or time needed for loading, unloading, and servicing an aircraft...

, occurring as the last to two bars of a chorus
Strophic form
Strophic form is the simplest and most durable of musical forms, elaborating a piece of music by repetition of a single formal section. This may be analyzed as "A A A..."...

 or section. I−vi−ii−V typically occurs as a two bar pattern in the A section of the rhythm changes
Rhythm changes
In jazz and jazz harmony, "rhythm changes" refers to the chord progression occurring in George Gershwin's song "I Got Rhythm". This pattern, which forms the basis of countless jazz compositions, was popular with swing-era musicians: It is found in "Shoeshine Boy" and "Cotton Tail" written by...

.
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