Originally Posted by: HambergIn any given key the 3rd interval is a modal scale step. So that means it can be flattened to a minor interval without changing the key. But wouldn't flattening the 3rd make the entire key minor. Because with a major third the 1st triad has the root third and fifth, while with a minor third the 1st triad has the root minor third and fifth?

This doesnt make sense to me.

Well if u play a major key, say C and C's relative minor is A. U can play an Aminor scale over the major key and the key still keeps its major sound, but ur playing the 6th degree of the scale(Relative minor - Aiolion mode) for a diff sound...modes give a different feeling to any givin key..