Watch the Real Harm online guitar lesson by TrueFire from 50 Licks Greatest Hits Vol. 1
Pretty as they may be, harmonics can also be used to add a little dissonance and color. After all, you're pretty much locked into the few notes open harmonics offer regardless of the harmony of your song, so they're only going to be harmonically appropriate if you've planned your changes accordingly. Here, a jazzy chord is punctuated by two harmonic strokes across the fretwire at the 5th and 7th frets.