| The example provided here is a variation of the Blues in "E". Rather than playing a bassline to accompany an E Dominant Seventh chord, the example uses an E Minor tonality. The E Dorian mode works great for this. The "A" chord is still a dominant Seventh chord, so you can use the A Mixolydian mode there, but the "B" chord is another minor chord - the Natural Minor scale or a B Minor pentatonic scale (with a few Blues notes and passing tones) works well on the B Minor chord. While "Diatonically speaking", the tonality of this blues could be analyzed as D Major, these are still just "good old Blues in E". Only... they're in E Minor. More information about modes, mode and chord relationships, diatonic darmony, and key centers, is available in the book, The 4 String Bassist's Guide to Understanding Music.
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