In music, the circle progression is a chord progression named for the circle of fifths, along which it travels. It is, "undoubtedly the most common and the strongest of all harmonic progressions," and consists of, "adjacent roots in ascending fourth or descending fifth relationship," with movement by ascending perfect fourth being equivalent to movement by descending perfect fifth due to inversion.[1]
The circle progression is commonly a circle through the diatonic chords, chords of the diatonic scale, by fifths, including one progression by diminished fifth (in C: between F and B♮) and one diminished chord (in C: Bo):
I-IV-viio-iii-vi-ii-V-I 
Circle progression in major: full (help·info)
Shorter common progressions may be derived by selecting certain specific chords from the series completing a circle from the tonic through all seven diatonic chords,[1] such as:
I- V-I = I-V-I
The ii-V-I turnaround also lies at the end of the circle progression.
Sources
- ^ a b Bruce Benward and Marilyn Nadine Saker, Music In Theory and Practice, seventh edition, 2 vols. + 2 sound discs (Boston: McGraw-Hill, 2003) 1:178. ISBN 978-0-07-294262-0.
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