Seems a bit silly that we have gone this bar in the blog without mentioning secondary dominants as much as they should be. Nonetheless, they are common in music composition and deserved to be discussed.
A secondary dominant is the V7 of a chord besides I (usually the V7 / V ). The progression would be:
V7/V – V7 – I
And that is one way to resolve it. Simply use it like the nature of the V7 chord and resolve to the chord a P5 below it.
Another way, that is common in jazz, is to have it resolve to the minor version of itself. That progression would be:
V7/V – ii – V7 – I
Both the V7/V and ii have the same function of being the “predominant area” so it makes sense that they can lead into one another.
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