Originally Posted by: equatorThe Blues Scale is a variation of the Minor Pentatonic.
It contains all the notes of the Minor Pentatonic, plus the diminished 5th.
So, the generic formula for the blues scale is:
[1-b3-4-b5-5-b7]
[E-G-A-Bb-B-D]
As you can see, the blue note is not the flatted third, but the diminished 5th.

Yeah, but that's a minor blues scale. in a Major Blues scale the blues note is b3.

I assume in 1-b3-4
You mean a minor third. It is a minor-based scale, after all.