Watch the Charlie's Swing online guitar lesson by Matthieu Brandt from Guitar Lab: Triads and Hendrixian Double Stops

Blues is another great style to use triads in, expecially if there is more than one guitar player in your band or at the jam.

By leaving out the root or the perfect fifth of the chord AND adding the flatted seventh, you'll create new "dominant seventh triad" shapes (so to speak). With these triads you can create the same smoothness in your arrangement that we've seen in earlier examples. You'll end up with transparent and cool sounding chord shapes.