There are several ways that we can use the Diminished Scale to sound bluesy. The easiest way is to directly blend it with the Minor Blues Pentatonic off of the same root of the key that you are working within.
If you were perhaps jamming on a typical 12-Bar Blues in the key of "A," then you can simply blend the notes of the, "A Diminished Scale," along with the notes of "A Minor Blues Pentatonic Scale."
Another cool idea is to blend scales off of the Major third of any Dominant 7th chord. This means that if you wanted to play the Diminished Scale to cover the appearance of an, "F Dominant 7th chord," you can select the major 3rd from the Dominant chord (which is an "A" note) and then utilize that Major 3rd, "A," note as the root of the Diminished which can cover the appearance of the "F 7" chord.
In an "F 7," the note of "A" is the Maj. 3rd, so therefore you can play the "A Diminished" over the "F 7."
In the video I examine how the Diminished Scale looks upon the fret-board by demonstrating a scale fingering pattern. Then, we'll try blending a few Diminished Scale lines into some guitar licks that you can practice. All examples will have either on-screen TAB or fingerboard diagram.
Watch the video below to follow the complete lesson-plan:
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