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Originally Posted by
Christian Miller
Aha my favourite sub
Usually it's used as a sub for the first I chord in a ABAC tune, often on the second repeat. For example IIRC Ted Greene uses it in this way on his recording of They Can't Take That Away. Some you might already subbing without realising - I Thought About You originally started on an F chord, not a Bm7b5, but most people play that these days.
The short answer is that it contains the root and third of the I chord and the reason it works better as a chord in this position rather than a resolving chord is that it is a great first chord for an extended turnaround. Which is how it is used in ITAY. So you can take a 1-6-2-5 for example:
C | A7 | D-7 | G7
And change to
F#-7b5 B7 | E-7 A7 | D-7 | G7
Won't work with every melody.
Not a big fan of theories of harmony. In general, I think if you have a strong baseline and good counterpoint with the melody, chords will take care of themselves.
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