Before we can play the blues, we have to understand how the blues are built. The scale is a little different, including “bent” or “blue” notes.
On a piano you can hear the C minor pentatonic or C Blues scale by playing these six notes:
C – E flat- F- F sharp- G- B flat.
Like the other scales we’ve discussed, it has a particular pattern that can be moved to any root note by using the same structure of half steps and whole steps.
Respectively, the scale is built one, flat three, four, flat five, five, flat seven- but try just learning it in C first. I recommend playing up and down the scale until you are very comfortable with it, and then just noodling around with those notes. See what melodic phrases occur to you naturally and have fun.
Here's a video tutorial so you can see the scale being played.