Many people think that the pentatonic minor scale and the blues scale are two guitar scales that are the exact same. In fact: the pentatonic minor scale contains 5 notes….the 1st, b3rd, 4th, 5th and dominant 7th from the associated major scale, while the blues scale contains 6 notes……..1st, b3rd, 4th, b5th, 5th and dominant 7th. Although the b5 note should be used as a passing tone it does add to the jazz/blues groove of certain styles of blues. Master bluesman Michael Bloomfield used the b5 note a great deal in his solos. The same b5 note works great as part of a trill lick. Another scale that can be used with some types of blues is the dorian scale. Because it contains 7 notes including a b3 and dominant 7th, this scale can give a blues tune a blues-rock vibe. Below are some free guitar tabs to show the blues scales.