Harmonic Sequence
I — IV — VII — III — VI — II — V — I
I — VI – IV — II — V — I
I6 – II6 – III6 – IV6 – V6
V7 of V (Secondary dominant)
A chain of dominant chords
e.g. A7 – D7 – G7 – C
C7 – F7 – Bb7 – Eb
Diminished chord
C# dim – Dm
F# dim to Gm
German 6th – Decorating V7 & I
Ab 7 – G
Db7 – C
Photo by Brian Kwok @ July 2016