How far can you go and still be related? Pretty far, it turns out. You can move any three notes up or down a half-step, moving practically all the way to the "chord above" or "chord below" and it all still sounds related. Very unusual, but related. When you move three notes up, you get into another family of four dominants; when you move three notes down, you get a new family of min7b5 chords that are related to those new dominants. Bizarre, but true.

Keyboard Chord Decoder 5 Move it all, find new families