Sorry Marion, I got a little side tracked... and I just plain forgot that I had posted here. Each song has a key, and a predominant mode... start with this, and then shift as the song shifts... I think of pentatonic scales as skeletons... that needs to be fleshed out... and that are structurally necessary... I wouldn't play a minor scale in a major keyed song... a 'blues scale' is a pretty vague term for me... could you be more specific? thanks, ttr