Watch the A Dorian Mode online guitar lesson by Brad Carlton from Guitar Lab: Dorian Dominance
Pentatonic scales are a useful and familiar tool for guitarists. Inside the Dorian mode there are three pentatonic subscales. Diagram 66 displays the A minor pentatonic scale which could also be called C major pentatonic. This explains my labeling of I min pent/ VI maj pent. As you can see from the diagram the resulting scale degrees are: 1, b3, 4, 5, b7. The next pentatonic subscale would be E minor pentatonic or G major pentatonic (V min pent/ bVII maj pent). This would create a different sound because one note has been changed from your previous pentatonic subscale. The b3 has been replaced with the 9 (2). I suggest you compare diagram 67 with diagram 66 to see this change. Because of this change there is a more harmonically extended or jazzy sound to this pentatonic approach. Our final pentatonic subscale is presented in diagram 68. It would be B minor pentatonic or D major pentatonic (II min pent/ IV maj pent). This would be the most extended sound because the b7 has been replaced with the 13 (6).
Be sure to apply these three different pentatonic subscales over the jam tracks to hear the different sounds that you can create.