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We look at how the sequence II-V-I is used for modulation.
We’re going to have a look at a tune that modulates to another key - in fact, it’s in F and it modulates to A major, and then from A major back to F major.
A powerful device for modulation is to use II-V-I. For example,
let’s get to C with a II-V-I: so the II is D minor7, the V is G7 and the I is C. Now supposing we wanted to go to F say, then we do a II-V-I for F. So that’s, in terms of roots, G C F.
Supposing we want to now go to A major: II-V-I B, E, A are the roots.
Let’s get to some other point: E flat major II-V-I
F, B flat E flat : F minor7, B flat7, E flat major7.
So II-V-I a powerful device for modulating, for changing key.
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