Now our four chord out of A flat is E flat right. We start on A flat, one, two, three, four, D flat, and here is your D flat seven scale. (playing piano) So all of the black notes now we're using these two white notes and if we go through one, two, three, four, five, six, seven, we can play our one, three, five, seven. I'm using the same scale (blue scale) on my right hand and A flat blue. (playing) I go back to the A, D flat, A flat, D flat, so that is your two chord, your D flat seven which is the four chord or the fourth note coming out of the A flat scale which is our second chord we learned out of the blues.