So, I had the book "Expansions" by Gary Campbell recommended to me so I picked it up. (around $13 on amazon after shipping). Anyhow, first scale in the book is "Pentatonic b3." It consists of 1-2-b3-5-6 or in the key of A (as I'm practicing it to start): A-B-C-E-F# Basically, it works really well over a minor chord with the root on 1 (Am), a Maj7#11 with the root on b3 (Cmaj7#11) and a 7#9 with the root a half step down from 1 (Ab7#9). I can doodle around pretty well around the fifth fret on this scale but there are a few intervals that make it so there is only one note on a string here and there. It is making it difficult for me to see the shapes and patterns that this scale has to offer. I'm trying to play it in as many positions as possible but I find that I will ascend the scale with one pattern but use a different pattern on the way down. How would you go about learning this scale up and down the neck? I'm sure I'll get it eventually if I noodle around enough, but maybe you've got a better idea? Anyhow, it's a pretty nice sounding scale. It's just the Melodic minor scale with the 4 and 7 omitted. (no tritone) Check it out! You might like it!