I have been having trouble writing progressions in other modes, and I think this question might get me one step closer to understanding the modes (in this case just Aeolian) from a different perspective.
The Aeolian mode is a diatonic scale also called the natural minor scale. On the white piano keys, it is the scale that starts with A. In other words, this scale contains all of the same notes as the C major scale--just in a different order. That being said, there is still something called Aeolian harmony, which has (apparently) a somber quality to it. Why is this? What restrictions are placed on the a minor scale that makes it feel "Aeolian" and not simply like the minor chords from the C major scale?
Can someone explain why the leading tone is avoided?
I understand modes insofar as they are formulas for scales. I never really understood their implication for harmony and chord progressions, though. Does all theory about functionality (aka tonic-dominant relationship etc) go out the window? Are there cadences in the Aeolian mode (is a PAC in Aeolian what we would usually call a deceptive cadence?) Such a confusing concept for me.