Can you see how understanding "Keys" can relate to a very big picture, which relates to a very
big peice of
This idea of Intervals, Scales, Keys, Chords, Harmonies, Modes, etc...is what's contained in Diatonic
These are each parts of Diatonic Theory, and as you can see each point is important to understanding the
function of most of the Music we listen to or will play.
And, no point is more important than any other point.
This is why I will always stress learning Keys and chords BEFORE a guitarist starts playing
You'll see by knowing these things, these constants, these commonalities, you can lay the ground work for
learning how Modes function. And, you can also see that without this information that Modes are NOTHING but fretboard pattern that few people ever get past and move on to using them for music as opposed to nothing but patterns.