I'd clock that as two chunks, really: floating a G major blues scale for beat one, into a Db- pattern beat two, repeated up a fourth as an Ab- pattern beat three. Quartal fun. If you're looking at JUST the first two beats, I guess you could look at a B dominant 7 bebop scale that starts on a flat 13, but that seems like a stretch. What would you see it as?
Went to his web sight to order this PDF thats on this video but it is nowhere to be found. Anyone know the name of this Gospel blues piece or where to find it