This is the most known and the most used of the minor blues scales. This is simply the minor pentatonic scale with an added b5.

This added note is sometimes reffered to as the blue note and brings a very bluesy sounds to your jazz guitar lines. This minor blues scale is very useful when improvising over jazz blues tunes.

Minor blues scale with b5 1 b3 4 b5 5 b7 Minor pentatonic scale 1 b3 4 X 5 b7

Because the minor blues scale with a b5 is similar to the minor pentatonic scale, you can use it over the same types of chords as the minor pentatonic scale :

Minor Triad Chords

Major Triad Chords

Minor 7th chords

Dominant 7th chords

Minor Blues Scale Guitar Diagrams

Here are the five modes of the minor blues scale with the blue note (flat five).