There are several different scales with a different number of pitches that are called as blues scale. While there are blues scales which are hexatonic, heptatonic and even nonatonic, I will tell you about hexatonic one here.
The hexatonic or six-note one consists of a minor pentatonic scale and a flatted fifth degree. Let’s have a look at an example now.
C Blues Scale
This is C blues scale. Notice that the first and the last notes are same. So there are only six unique notes in this scale. The marked one is the flatted fifth degree that we add to C minor pentatonic scale. Since they are enharmonic equivalents, we can use G flat instead of F sharp.
All Blues Scales
Now let’s have a look at all blues scales that we can build.