So let me see if I have this right; if you have a scale lets say Eb= Eb F G Ab Bb C D Eb, and I did 1 4 5 progression and for fun I wanted to do a lil run on the 4 which is Ab, would I just run the Ab scale or is this the place where the Mods come in...Just asking
This scenario is where understanding Modes would come in. Also knowing arpeggios, and when to play a major or minor pentatonic.
In you example only one note from the Ab scale wouldn't fit in the key of Eb. THe D would be a Db. So the Lydidan mode would be all the notes of the Eb scale with the Ab as the tonic.