Variations::50s progression


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50s progression in C variation, ending with C
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As with any other chord progression, there are many possible variations, for example turning the dominant or V into a V7, or repeated I–vi progression followed by a single IV–V progression. A very common variation is having ii substitute for the subdominant, IV, creating the progression I–vi–ii–V (a variant of the circle progression) and thus the ii–V–I turnaround.

Variations include switching the vi and the IV chord to create I–IV–vi–V, as is used in "More Than a Feeling" by Boston<ref name="Bennett">{{#invoke:citation/CS1|citation |CitationClass=book }}</ref> and "She Drives Me Crazy" by Fine Young Cannibals.{{ safesubst:#invoke:Unsubst||date=__DATE__ |$B= {{#invoke:Category handler|main}}{{#invoke:Category handler|main}}[citation needed] }} This is also similar to the "pop-punk chord progression", I–V–vi–IV.

The harmonic rhythm, or the pace at which the chords occur, may be varied including two beats (half-measure) per chord (About this sound Play ), four (About this sound Play ) (full measure or bar), eight (About this sound Play ) (two measures), and eight beats per chord except for IV and V(7) which get four each (About this sound Play ).<ref name=scott/>:206

"Sleep Walk" by Santo & Johnny uses a similar progression, with the IV replaced by its parallel minor iv for an overall progression of I–vi–iv–V.{{ safesubst:#invoke:Unsubst||date=__DATE__ |$B= {{#invoke:Category handler|main}}{{#invoke:Category handler|main}}[citation needed] }}

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