Watch the Major Blues Scale online guitar lesson by Jeff McErlain from Blues Guitar Survival Guide - Lead
The major pentatonic scale formula is R 2 3 5 6, to get a major blues scale we add in a b3rd. So the new formula is R 2 b3 3 5 6. When using this scale we have to be careful to treat the b3rd as a passing tone as it really clashes with the major 3rd of the major chord we would be soloing over. It sounds great and makes things a bit more... bluesy. I really associate this sounds with the Allman Bros, especially tunes like Melissa, Blue Sky, and Ramblin' Man. Not blues tunes I know but they are great uses of the major blues scale is its pure form. This scale is also used a great deal in country music as well and really helped me in those situations, which fortunately don't happen that often! I love country music, I just don;t play it very well!