12 Blues Scales
Scale Formula: R - 
3 - 4 - 5 - 5 - 7
Blues scales are commonly used to solo over Major and minor blues, and over minor chords in general. The Blues scale is utilized to create a 'bluesy' feeling, or an 'earthy' quality. It is used by Rock, Jazz, Blues, and R&B players aboundingly.
For example, you can use the G blues scale to solo over G blues (or Gm blues). In this instance, you are making a single scale choice for an entire harmonic progression.
It is also possible make a scale choice for each chord in the series. When you do this (make multiple scale choices) for the blues, you can use the blues scale for the corresponding root of the chord (A blues for A, B blues for B, etc.).
A Bit of Guidance
The flat 5 is also the sharp 4 (the tritone - 3 whole steps - 6 half steps) and can be named the sharp name as in some of the examples above. This tone acts as a passing tone, not a strong beat tone. It should occur as a connection tone between the 4 and 5.
For minor type chords, the blues scale is a good fit. It is also common to alternate between the Dorian mode (R-2-3-4-5-6-7) and the blues scale.
Download pdf of Blues Scales in 12 Keys
Play through each scale. The tab for each scale is given, yet this is only one of many possible fingerings. Improvise with given octave. If a particular fingering shifts (changes positions), try sliding between positions.
Finally, as with all scales, find out what types of chords it generates.
