Electric Bass: Every Key a Tune Gets Called In

Pick the key. Its seven chords, and what this seat does across them.

A tune is called by its key and its form, in that order, and everything else follows. Pick the key here and it arrives as its seven chords with the two-five-one already visible inside them.

The substitution rules on the changes pages are edits to these seven. Nothing in this idiom starts from nowhere.