Let’s explore this with a couple of examples. First, a jazzy II-V-I in C major would be Dm7-G7-Cmaj7. Then, if we move the G7 up a tritone/aug 4th/dim 5th, we will get a Db7. Now, the ...

I’ve highlighted A for particular attention here because it’s such a nice key on the guitar, but you’ll notice below that a Cmaj7 has crept in on Example 5, too. Why? Well, it’s a nice ...